Lynn and I were dating for over a year when this story took place. Lynn was a very nice girl. She was intelligent. It was fun hanging out with her, talking about various things. Sex was nice too. I really liked her body because she had a large ass and fairly large tits. She was OK with what she called `normal sex'. This meant that in addition to regular sex, she let me finger her pussy, and I got blow jobs every once in a while. Anything more kinky was out of the question. I loved her ass but she wouldn't let me enjoy it much. She always said she was embarrassed at how large it was. It all happened when Lynn and I went to a U2 concert in Chicago. We live in Topeka, more than five hours away from Chicago. My old and beat-up car would never survive such a trip so we decided to take the bus. We decided to take a midnight ride to Chicago, spend a day in the big city, watch the concert and take a midnight ride back to Topeka. We were pretty excited when we boarded the bus at our local bus station. Lynn got a window seat and I sat on the aisle. We talked about how great the concert will be, and how much fun we'll have in Chicago. As soon as we left the station the driver dimmed the lights. The bus was about half full. I never realized how many people take the midnight bus. I looked around and checked out the other passengers. Most looked old and tired. Must have had a long day. A few minutes later we crossed the Topeka city line and the driver turned the inside lights off completely. It was pitch dark outside and most passengers were already sleeping. Lynn put her head on my shoulder and tried to get some sleep. We were quiet for a while and Lynn fell asleep. With the vibrations of the bus her head shifted until dropped to my lap. I was too excited to sleep so I squeezed towards the aisle and let Lynn lie down with her head in my lap. I sat awake for a while longer thinking about the coming day. I have only been to Chicago twice before but it was years ago, with my parents. I never had a chance to experience the city as a grownup. Lynn was sound asleep. I put my hand on her shoulder and brushed it slowly. Lynn loved to be pat. She curled in her sleep as she enjoyed my patting. Slowly, not even thinking what I was doing, my hand moved to her waist. I would often do it at home, in front of the TV. Lynn always loved the attention. I didn't think of the other passengers on the bus. I was quite sure that they were all asleep. Slowly, my hand reached under Lynn's dress and started rubbing her butt. As I was rubbing her I suddenly realized that we were in a public place. I started developing a hardon. I always wanted to have sex in public. The public was all asleep and this wasn't even close to sex but my hardon didn't care. I kept on rubbing Lynn's butt and slowly inserted my fingers under her panties. My hand got closer and closer to her pussy. Lynn was a deep sleeper and the low rumble of the bus rocked her into an even deeper sleep. My hand reached farther into her panties until it hit her pussy. First the outer lips, slowly rubbing back and forth, closing in on the entrance. I guess my rubbing felt nice because Lynn was now very wet. My finger slid in easily and started massaging the length of her crack. I massaged up and down for a while, getting closer and closer to her clit. I was quite sure she would wake up as soon as I touched her clit. Lynn had very sensitive clit. She never lets me touch it directly. I knew I should stop but I was having so much fun and wanted more. I started brushing my finger very lightly on her clit. Her body started moving rapidly. I stopped for a few seconds, let her body relax, and started again. This time I tried to go even lighter. Now she moved very slowly but didn't wake up. I went on rubbing and Lynn's body began a wavy motion. Her hips and back moving back and forth in a fucking motion. I was so concentrated on Lynn's clit that I didn't pay much attention to the people around us. All of a sudden I realized that not everyone was asleep on the bus. In fact, the guy sitting right across from us was awake. He was a bit older than us. He was staring at us silently. Actually, he was staring at my hand. He couldn't really see much of Lynn's butt because it was facing the window. For the first few seconds I was scared: I was caught. I sat motionless not knowing what to do, but the guy staring at us didn't do anything. My finger was still touching Lynn's clit and the entire situation felt bizarre. Although scared, I was starting to enjoy myself. I always urged Lynn to buy provocative and revealing clothes but she always refused. I could now show her off a bit. She would probably kill me if she ever found out, but I was too aroused to think. I moved my hand away from Lynn's pussy, slowly pulling her dress up. It took me more that a minute to get Lynn's dress up to her waist line. Our spectator kept staring at us motionless. I tried to pull Lynn's panties down but I couldn't get them very far. I knew that if I try too hard, she would wake up. I inserted my hand in her panties again and started rubbing her clit again. Her body started moving again. As it was moving I managed to push her panties down to her thighs. I looked at our spectator. His head was stretched towards us, trying to see as much as he could. As I felt Lynn's motion speed up, I increased the pressure on her clit. She started moaning in her sleep. Luckily, the bus engine was loud and no one could hear her moans (or so I thought). Her wavy motion became stronger and stronger until she started shaking. She was having an orgasm. Her body shook for a few more seconds and then it stopped. She slowly rolled and looked up. `It was very nice' she whispered. I immediately looked towards our spectator but he pretended to be asleep. Smart guy. She sat up, gave me a long kiss, smiled and whispered: `Someone could have seen you. Did you even check ?'. She looked around but all the passengers looked asleep. I was in the mood for some more playing so I tried pulling her dress up all the way. I wanted to expose her breasts and give our sleepy spectator a last view of her body but Lynn protested. She quickly pulled her panties back up, whispering: `How did you get these down without waking me up ?' The rest of our bus trip was uneventful. We arrived in Chicago very early in the morning and spent most of the day in the downtown area and on the lake front. Lynn was in a very good mood after the late night orgasm. I think she enjoyed my risky behavior from last night. I managed to talk her into removing her panties and bra before the concert. Gliding my hand along her back and down to her butt felt very smooth and nice with no under garments on. During the concert, people were standing and dancing to the beat of the music. It was very dark so Lynn let me slide my hand between her thighs, and slip a thumb into her pussy. As she was jumping to the beat of the music, she was actually riding my finger. Lynn was quite inhibited and I was surprised that she let me finger fuck her in public. Maybe the bus ride softened her a bit. The concert ended after 11PM and we hurried back to the bus station. We barely got there on time. We boarded the bus about a minute before it left the station. This time, I got the window seat and Lynn got the Aisle seat. I had some plans for the way back home but I was too tired. I fell asleep even before we left the Chicago city line. I don't know how long I slept. I woke up feeling something wet on my dick. I opened my eyes and saw Lynn's head buried in my lap, giving me a blowjob. I touched her hair and she raised her head, winked and said: `I really enjoyed last night. Now it's your turn'. Her head went back to my dick. I looked around. The bus was almost empty. Our area of the bus had very few passengers, all asleep. I imagined Lynn verified that they were sleeping before she started. She was standing on her knees and elbows with her butt sticking in the air towards the aisle. My hand started roaming down her back until it reached her butt. I slid my hand under her dress and stared playing with her pussy. I inserted one and then two fingers into her pussy. She was very wet. She didn't have an orgasm during the concert so she must have been very horny since then. I started finger-fucking her with two and then three fingers. Her butt welcomed my fingers and she shifted it rhythmically towards my hand. This went on for a while. Suddenly, I saw some motion at the corner of my eye. I turned around quickly and caught one of the sleeping guys across the aisle quickly closing his eyes - pretending to be asleep. Unlike yesterday, I already knew what to do. Lynn's ass was now facing the aisle - all I had to do was lift her dress in order to expose her completely. I didn't want Lynn to notice anything so I had to be very careful. I slowly lifted the edge of Lynn's dress and folded it above her butt. I then went back to finger-fucking her so that she doesn't get suspicious. A minute later, our spectator realized that I prepared an entire show just for him. He stopped pretending to be asleep and moved closer to the aisle. He was sitting three feet away from my hand inside Lynn's pussy staring intently. He was about my age and looked pretty average. I didn't know what to do next. The guy seemed happy enough just staring at Lynn's pussy. I remembered Lynn tellking me about female fantasies a while ago. She said that many of her friends fantasize about having sex with two guys. She never admitted that she also fantasized about it, but I was pretty sure. Having my dick licked and my fingers stuck in Lynn's pussy I was very aroused. I wasn't thinking very logically. I reached into my jacket pocket, and slowly pulled out a condom. I signaled our spectator to be silent and handed him the condom. His jaw dropped. For a few seconds he was completely frozen with disbelief. Then he got up, unzipped his pants, pulled his disk out and put the condom on. I still wasn't sure I should let this happen. I was simply too horny to even consider any circumstances. I took my hand out of Lynn's pussy and made a measurement motion with my fingers stretching about 2 inches apart. I think he got it. I knew he should be very slow so that Lynn doesn't stop the party. He inched closer to Lynn's butt and started inserting his dick in. He inserted about two inches and started moving back and forth. Lynn's ass moved back and forth, intercepting the guys dick. Slowly, he inserted more and more of his dick into her pussy. His balls started pounding on her clit and belly with every thrust. I was wandering when she would notice that these weren't my fingers in her pussy. Suddenly, she stopped sucking my dick. She felt something was wrong but couldn't quite place it. I quickly put my hand on the back of her neck and started massaging it, trying to relax her and making sure she doesn't lift her head and see the guy. I don't know if she completely understood what was happening but she resumed her sucking and started moving her ass even faster towards the guy's dick. I looked around us. Two more guys were now awake. They were both staring at the guy fucking Lynn and at me. They met my glance and their eyes were almost pleading: `Can we go too ?'. I decided that since I already allowed one stranger to fuck Lynn, I may just as well extend the party. I checked my jacket pockets and found two more condoms. I handed them to the new guys without a word. It's hard to describe the pleased looks on their faces when they saw the condoms. The first guy was still pumping Lynn's pussy so I decided to keep the new guys busy for a while. I pushed Lynn's dress up as far as it went. Her entire back and tits were now in view. The two guys stood behind Lynn's seat and started touching her back and ass. One of them started fondling her tits and pulling on her nipples. The other guy was rubbing her back, slowly moving towards her ass. As he reached her ass, he licked his index finger and ran it around her asshole. Lynn never let me have anal sex with her. She said it humiliated her. I was quite sure she wouldn't want a finger up her ass so I motioned the guy to be careful. He kept on rubbing his index finger at the entrance to her asshole - not pushing his luck. Suddenly Lynn did something that stunned me: she moved her hand towards her butt, caught the guys finger playing with her asshole. Instead of pushing it away, she stuck it deep into her asshole. She was more horny that I have ever seen her. I wanted a piece of that new territory. As soon as the guy pulled his finger out of Lynn's asshole, I stuck mine in - as deep as it would go. I began finger fucking Lynn's asshole as fast and as deep as I could. Lynn loved it. She started making strange sounds and her butt moved even faster. She now had a dick fucking her pussy and a finger fucking her asshole. Her sucking was now very strong - almost painful. I felt my orgasm building up in my balls. I couldn't hold much longer. I wanted to get even more kinky before I came so I pushed a second finger into Lynn's asshole. Her tight hole was even tighter now. I couldn't take it any more and I came. Lynn never swallowed my cum, but after the other things she did tonight I wasn't surprised that she swallowed all of it. Instead of rising up and looking at the guys fucking her, she left her head in my lap. In fact, she hid it in my lap. I think she was too embarrassed about this and didn't want to face the guys. She just wanted them to go on. The guy inside Lynn's pussy finally came. He zipped himself up and moved aside. A second guy took his place almost immediately and started thrusting his dick into Lynn's pussy. I don't think Lynn even noticed the change. This went on for about a minute. My fingers were still pumping in and out of Lynn's asshole. Suddenly the guy fucking Lynn motioned me to move my hand away. As soon as I moved it he plunged his dick quickly into Lynn's ass. His dick was wider than my two fingers and Lynn's asshole had to quickly adjust to the new size. His dick sank in completely and Lynn started yelling and screaming. Luckily, with her face hidden in my lap her screams came out muffled and no other passengers woke up. A few seconds later Lynn got used to the dick in her ass and stopped yelling. She started moving her ass towards it. A minute later Lynn moved her hand from under her belly towards her pussy. I thought she was going to finger herself. Instead, she started fondling guy's balls every time he pumped all the way into her ass. This ball tickling was too much for the guy and he quickly came. He moved aside and the third guy replaced him. This guy's dick wasn't extremely long but it was very thick. Lynn's pussy was already very lubricated but it took some efforts to slide that thick dick in. As he slid the dick in, I could see Lynn's pussy lips expanding to contain it. Lynn started moaning and mumbling words I didn't understand. As he started pumping Lynn's mumbling turned into words and then into cries. For the first time in my life I heard Lynn yell: `Fuck me harder' and `Faster'. After a minute or so, she started yelling `I'm cumming. Fuck me faster' over and over. She started shaking as the orgasm hit her. Unlike her past orgasms, this one lasted for almost a minute. She went on shaking and mumbling as her orgasm subsided. I didn't even notice it but while Lynn's was yelling and cumming, the guy fucking her also came. Lynn kept standing on her knees and elbows for a while. Maybe she was waiting for another guy to stick his dick in. I was out of condoms so this had to be the last guy. When she realized that all the guys were done, she slowly rolled onto my lap, pulled her dress back down and hid her face in my jacket. The guys figured out that the show was over and went back to their seats. When we were alone again, she kissed my chin and looked very embarrassed. `Are you mad at me ?' she said at a very low voice. I nodded `no'. `It was the most amazing thing I have ever had' she said, blushing. `Do you still love me after I behaved like a cheap slut ?' I smiled, kissed her and said `You have no idea how much'. We hugged and kissed for the rest of the bus ride. I couldn't resist the temptation, slid my hand under her dress and stuck two fingers in her asshole. It was such an exciting new revelation. I was hoping I could explore it some more soon. Lynn didn't mind my exploration. Our sex life changed dramatically after that trip. Lynn lost all her inhibitions. She now wanted to do things that even I considered too kinky.