Note: This story was dynamically reformatted for online reading convenience. After Ally and Brian finished up in the shower, they went to the pool together. Ally liked going with Brian better, because she didn't have to go through the ordeal of putting on a one piece and hiding her real bathing suit to fool her mother. She was able to just wear her thong bikini, and not have to worry about anything. They got there before the pool opened, and Ally went to lie out and tan while Brian set up the pool for the day. Ally was lying on a lounge chair, eyes closed and half asleep, when she felt something warm rub against her cheek. She opened her eyes, and Chris was standing over her, his erect cock poking her in the face. Ally didn't even say a word. She just turned her head, opened her mouth, and Chris slid his dick right into it. Ally knew nobody else was at the pool yet, so it didn't bother her sucking Chris off right then and there. Chris pumped his cock in and out of Ally's mouth while Ally sucked him off. After just a couple minutes, Chris unloaded his wad into Ally's mouth, which she immediately gulped down. Chris pulled his cock out of her mouth, pulled his shorts up, and went back to what he was doing. He couldn't believe how easily Ally had let him use her. He hadn't even said a word to her, just shoved his dick in her face, and she had blown him, no questions, no comments, no nothing. Then he had shot his load down her throat, which she happily guzzled down, and then he had just walked off. Damn, he could get used to this! Just as the pool opened, Nikki and Jenni came in. Nikki seemed animated, excited over yesterday's events. Jenni, on the other hand, looked exhausted. The two girls came over and sat on either side of Ally. Both girls pulled off their tank tops and shorts, and started applying sunblock. Ally did notice that both of her friends were wearing bikinis today, which was a little unusual. Ally asked Nikki to put sunblock on her back, and Nikki obliged gladly. Ally was lying face down on the lounge chair, and Nikki untied the strings of Ally's bikini top and started to apply the lotion. Nikki rubbed it into Ally's shoulders, and started working her way down. She was hardly subtle when she reached down under Ally's armpits and rubbed her hands on the sides of Ally's breasts. Ally let out a little moan and a smile in response to that. Then Nikki continued down, rubbing the sunblock into Ally's lower back. Of course, Nikki's hands quickly, inevitably, found their way onto Ally's gorgeously cute ass, which was of course almost completely exposed by her sexy little thong. Nikki kneaded Ally's ass cheeks with her hands, making it totally obvious to Ally that Nikki wasn't thinking at all about putting sunblock on, she was only thinking about feeling up Ally's ass. But Ally was hardly opposed to this. On the contrary, Ally scooted her knees up a little bit on the lounge chair, so that her ass stuck up in the air a little bit for Nikki to play with. Nikki kept rubbing and squeezing Ally's ass long after the sunblock was thoroughly rubbed in. After a minute of rubbing Ally's ass, Nikki ran her fingers down Ally's thong, following the thin strip of fabric right down to Ally's crotch. Nikki pressed her fingers against the Lycra covering Ally's pussy, and Ally gasped. She was still very much sore and swollen from all the fucking her little ten year old pussy had taken in the past day. Nevertheless, Ally made no attempt to stop Nikki from rubbing her, and very soon, her thong had been pulled to the side a little, and Nikki was running her fingers through Ally's bare slit. Jenni sat watching Ally and Nikki playing around from the next lounge chair over. She had her sunglasses on, thank god, because that meant that the other two girls couldn't see just how intently Jenni was watching them. She kept staring at Ally's beautifully bare ass, and she kept imagining that she was the one rubbing lotion all over it instead of Nikki. Then Jenni's heart almost skipped a beat when Nikki pulled Ally's thong to the side. Jenni just sat there staring at Ally's pussy, again imagining that it were her fingers running through it instead of Nikki's. Jenni felt a warm, slightly sticky wetness between her legs, and suddenly she felt ashamed of what she was doing. Despite this, Jenni keeps watching with intense focus. Little does Jenni know, but her father had followed her to the pool today. He was determined to figure out what was going on with his daughter. He had followed at a distance, making sure Jenni and Nikki didn't see him. Now he was settled into some bushes about 50 yards outside the pool fence, with a pair of binoculars. The first thing John noticed when he settled in was Ally. John had been checking Ally out for a while. He knew it was wrong to think about his ten year old daughter's friend like that, but damn was she a hottie. Now he was looking at her, and she was wearing a tiny little bikini. Wait a minute... the girl's wearing a thong! Jesus, she's only ten! But good god, that's such a killer ass. John was starting to clue in to where Jenni's masturbation habit had come from. He continued to watch as Nikki rubbed the suntan lotion into Ally's back. It was undeniably erotic, because John had a massive hardon by now. John saw Nikki's hand slide down between Ally's legs, and remain there for a while. He watched Ally's face, and although he couldn't hear her from this distance, he could tell that she was moaning. Goddamn, Nikki was fingering Ally! Unbelievable! John turned his binoculars on his daughter. Despite the fact she was wearing sunglasses, there was no question she was staring at Ally's pussy, with nothing short of lust written all over her face. After Ally had an orgasm, all the girls settled back onto their own lounge chairs. Just when John figured he should get going, he watched as one of the lifeguards came over to the girls. A moment later, Ally got up from her chair, and headed over towards the guard shack. John doesn't think all that much of it until he sees Ally reach behind her head and undo the top of her bikini. She pulled her top off, although since she was walking away from him, all he could see was her bare back. Then, just before she walked through the door, Ally turned around and gave Nikki and Jenni a smile and a wave. At the same time, John got a perfect view of Ally's beautiful tits. Then, Ally turned around, and with a last look at that perfect little thonged ass, she walked into the building. John was sure there was something going on in that guard shack that he wanted to see, but he couldn't figure out how. Then he saw some motion at the right side of the building. He trained his binoculars there, and saw a window. It looked into the guard room, although it was near the top of the wall, so people on the pool deck couldn't see in. John could, because he was outside the pool area, and up on a small hill. Because of this, he could see directly down into the room, with a perfect view of the couch. John got his binoculars into focus just in time to see Ally untie her bikini bottom, and let it fall off. John got a great view of Ally's beautifully nude body, and then the lifeguard came into view, now also naked. John watched intently as Ally went down on the boy, and sucked his dick. Then, the guard took Ally and put her on her hands and knees on the couch, then positions himself behind her, and slides his dick into Ally's little pussy. Jesus, it seemed like just yesterday his own little girl had come home from kindergarten and told him about her new friend Ally. Now he was sitting her watching that same little girl getting fucked. Also a little unsettling was that John knew he wouldn't hesitate for a second to take that lifeguard's place if he had a chance. No, that's crazy! He thought. I'm a married man! That's my daughter's friend! She's only ten! Despite those protests, the fact stayed constant. John would fuck Ally if ever he got the chance. A few minutes later, Ally and the lifeguard finished up, and each of them returned to the pool deck. Ally and Nikki chatted animatedly when she got back, although John noticed that Jenni didn't join in the conversation. John watched for the rest of the day, and saw Ally repeatedly get called into the guard room, where she fucked and sucked two different lifeguards. He also saw Ally and Nikki play with each other a few different times, although Jenni never did any more than watch, despite the fact Ally and Nikki kept turning towards her, obviously asking her to participate. Every time, Jenni looked like she was on the verge of saying yes, but at the last second, pulled back, and merely continued to watch. Finally, the day was getting late, and he knew the girls would head home for dinner soon. Jenni would be walking back, while Ally and Nikki would get a ride from Ally's mother. About ten minutes before they were supposed to leave, John saw Ally head back into the guard shack. This time when she came back out, she wasn't wearing that sexy little thong bikini. Now she was just wearing a one piece, like any normal ten year old would wear. A few minutes later, Ally's mother picked up the two girls, and John knew that Ally's parents had no clue what she was doing at the pool. Jenni was headed home too, and John rushed to be sure he was home before her. John got into the house and into his bedroom before Jenni gets home herself. John had moved his car that morning, so that Jenni would think he was at work. So now she would have no idea that he was there when she got in. Sure enough, he heard her come in, and she didn't call for him or show any sign that she knew he was here. He slipped out of his room, and went out into the hall, which overlooked the living room. The first thing he saw was Jenni's pool bag by the door. Then he walked further towards the railing, and then saw her bikini top lying on the floor. A few feet past that was Jenni's bikini bottom. Then John saw his ten year old daughter lying naked on the living room couch, two fingers already buried in her little pussy. John pulled his own cock out of his shorts, and started to rub it. John kept his eyes locked on his daughter's hairless little pussy, and her little fingers flicking in and out of it with lightning speed. John began jerking it faster. Jenni started to moan loudly, still oblivious to the fact that her father was watching her. Both father and daughter were on the very edge of orgasm. John reached orgasm first. He closed his eyes, and shot his load hard. Unfortunately, John was standing right at the railing, and he shot so hard that his cum shot right through the railing bars, and fell down into the living room. John was standing looking directly down on his daughter as he jerked off, so it was close to hitting her. He realized, horrified, what was happening after the first and second loads landed on the couch, only inches from Jenni. He pulled back quickly, but not in time to save his last load of cum from sailing over the railing. He held his breath as it fell, almost in slow motion. It landed, splat. Right on Jenni's chest. Jenni's eyes snapped open, first looking down at her chest, and then a fraction of a second later, straight up at her father, holding his softening cock over her, looking back down at her, horrified. "Daddy," she asks, "what are you doing?" John had no idea what to do or say. "Sweetie, I, uh... well..." "Daddy, did you just cum on me?" John went bright red, but saw no use in denying it. The evidence was undeniable. "Yes honey. I'm sorry." Jenni looked down at the cum on her chest again, then back up at her father. John suddenly notices that Jenni still has her fingers buried in her pussy, and they were actually still moving around. "It's okay, Daddy." She pulled her fingers out of her pussy, stood up, and came up the stairs to her father. She was still completely nude, and John still had his cock sticking out of his shorts. "Daddy, can I tell you something?" Jenni asked. "Sure, what is it?" John answered, still very conscious of his dick exposed to his daughter. When he tries to put it back in his shorts, Jenni grabs his arm, pulls it back, and shakes his head. "No Daddy, leave it out." John hesitates, but obliges, leaving his cock out. Jenni then tells John all about the last couple days, how Ally had been seducing guys all summer, and how she had fucked two guys yesterday, how Nikki and her had put Ally's bikini up their pussies, how Ally and Nikki had messed around on her bed, how she had been masturbating the night before when he came in, and about all the thoughts she had been having over the last couple days. John is amazed at the story his little daughter is telling him. Although he had watched the girls and their games all day today, he was shocked at Ally's calculating and scheming. Then Jenni starts asking John questions. "Daddy, is it okay that I get excited when I look at other girls?" "Yes Jenni, it's okay to be attracted to other girls, a lot of girls are." "But I thought girls were supposed to like boys." "Well most do, but some like girls, and they're called lesbians." "So I'm a lesbian?" asked Jenni. "Well, do you like boys too?" Jenni looks down, and gives John's now limp cock a good hard look. Then she nods yes. "Well then, that means you're bisexual, you like both," says John. "And that's not weird?" "No, if that's what you like, then it's perfectly fine, honey." "Okay Daddy, thanks." Then comes the question John had been dreading. "Daddy, why did you cum on me?" John stumbles for a second, and then decides to tell her the truth. "Jenni, I saw you masturbating, and it got me so excited, that I had to masturbate too, and I made myself cum." Jenni frowns, but it looks more like frustration than anger or fear. "I can't make myself cum, Daddy. I keep trying, but it won't work." "Well honey, you just need to learn how to do it right." "Daddy, can you teach me?" John splutters and stammers, shocked. "I'm sorry honey, that wouldn't be right." "Please Daddy?" But John was saved from having to answer again. He heard a car pulling into the driveway, and knew his wife was home from work. Jenni heard it as well, and shot down the stairs, grabbed her pool bag and bikini, then bolted back up the stairs and into her room. John put his dick away, and went back into his room, totally bewildered and befuddled.