Note: This story was dynamically reformatted for online reading convenience. My name is Billy and I am blessed with a 14" cock which was fully grown by the time I was 10yrs old so you can imagine it was quite disproportionate to the rest of my size slim blond hair boy 5 foot 4ins. My shorts used to bulge even when I wasn't erect. When I became erect it didn't lengthen anymore just inflated and stood out proudly in front of me like a third leg. I became the sex object of my mother's friends which I loved but more of that later this is how it began: When I was 5yrs old I became aware that my mother and sister one year younger than me took a great interest in me when mum was bathing us together. My dad had been killed in a car accident the year before and his life insurance had left mum quite well off as I later discovered. At 5yrs old mum told me that my cock was 6" long and when I got excited it pointed up past my little bellybutton. My testicles were in proportion to my cock and regularly chaffed in my underwear. My mum would allow my sister and I to run around in the nudie around the house and garden as we weren't over-looked. During our bathing session mum would openly masturbate me and show my little sister how to help me get relief from my straining erections which were frequent. Mum would get naked by the bath side as well she had a nice slim body with small pointy tits with huge aureole and the nipples would brush the bath side as she washed us kids. Of course I was too young at this point to shoot sperm but the dry cum administered by my mum or eager sister eased my blue balls. One bath day when I was 8yrs old after my sister and I had got filthy in the garden mum was washing us both and showing me how to wash and tickle Sarah my little sister's pussy especially the little bump at the top which stood out about half an inch when we tickled it and this made my sister go crazy in a good way panting and gasping until she got all flushed and gasped for air. I later found out this this was called giving her an orgasm. Mum also taught me how to do this to her and she shaved the hairs off her pussy so it was easier for me and sis to lick. Boy did mum thrash about when we did this she then would put my cock in her mouth and suck me until I had the really good feelings. Mum got me to stand in the bath my cock sticking out like a flesh pole from my little body. Sarah climbed out and I followed my cock bouncing as I went mum led us through to her room which had a big bed. She told us to dry ourselves with the big fluffy towels she had given us and to then climb onto the bed beside her. Sarah climbed up first her little bottom and slit winking at me as she climbed up. I dried my bouncing cock and climbed up between mum's legs getting ready to lick her which we did a lot after bath time. Sarah started sucking and tugging on mum's tits which she loved mum put her fingers between Sarah's slim legs and started to play with her little button soon Sarah was squirming around and I went down to lick mum but she stopped me telling me it was time for me to learn to fuck her. I sat up my cock rearing up in front of me. "Sarah watch your brother," Mum told my panting sister. "Plenty time for that later." Sarah sighed panting "Mum I was nearly there!" Sarah sat up on the bed cross-legged exposing all her little charms to me her little clit standing out proudly. Mum took my hips and guided me unsteadily so that my cock was rest on the top of my mum's pussy it extended up toward her smooth belly-button. She took hold of it was rubbed it a couple of times and then pushed the head into her wet pussy. I felt it slide in like a warm velvet glove then mum grabbed my buttocks and pushed the rest of my cock into her she gasped as I bottomed out my heavy balls bumping on her bottom. "Wow!" she exhaled. "That is the biggest I have ever had, good boy." "Wowser!" Sarah gasped I noticed her fingers a blur on her own pussy. "It's all gone in mum." "I know," mum gasped. "It feels brilliant, are you okay son?" "Brilliant mum," I gasped feeling my cockhead deep in mum's pussy." "Now move in and out," mum told me. "Slowly." Gradually I learned how to slide in and out gain pace as the pleasure started to build up. Sarah orgasmed first rolling over on the bed gasping for breath her body heaving up and down she then lay there watching us still idly touch her pussy. "Mum!" I gasped. "I can feel that feeling coming." "Oh! Yes!" she hissed. "Fuck me harder son!" I did as I was told like a jackhammer then mum let out a shriek and her body went ridged and I could feel her pussy muscles rippling on my cock and I gasped and came in five bursts only this time it felt like I'd peed inside mum. I sheepishly pulled to still hard dribbling cock out of my mum's pussy only to spurt another shot of semi-clear liquid up over my mum's prone body. Mum opened her eyes and smiled at me. "Congratulations Billy," she said quietly "You're a man." As she said this she took hold of my cock and milked more clear liquid from the spurting head nine spurts in all until I fell back on my heels gasping for breath. "Mum," Sarah asked fingering my cum "What's that did Billy pee in you." "No love," Mum said "It was his first real cum, that's why I said he was a man now." "Oh!" she said not really understanding. I looked down at my still semi-hard cock proudly. Mum smiled at me "You are going to be a very good lover Billy." "Mum," Sarah piped up. "When can Billy do that to me?" My cock twitched at that. "Soon honey," mum said. "But we will have to be careful as you are quite small." Mum took some of my cum on her fingers from the pools on her belly and licked it. "Hmm!" she said. "Good taste the more you come the thicker it will get." Sarah followed her mum's lead and licked some as well. "Mmm! slightly salty but okay," was her prognosis. "Come on your two help me with the tea," mum patted our little bums and swung up off the bed we followed like nothing had happened, my cock swinging before me. In the kitchen it was like normal Sarah and I running around naked setting the table but this time mum was naked as well. All through tea my cock kept getting hard looking at my mum's tits and little sis and my cock would poke out above the table. "Say hello to Mr. Dick," Sarah would laugh as my cock head would come into view. Mum smiled but told us to eat our tea. "You know Billy," she started seriously. "You're very young to be producing even watery sperm it must be because your penis is much larger than boys of your age." I shrugged and carried on eating my tea. After tea we helped clear up and my cock relaxed and all six inches hung limply between my legs. "Mum can we watch TV?" Sarah asked. "Course," mum replied. We went through to the sitting room and I sat on the settee and Sarah lay down on the floor face down to watch the programme I couldn't take my eyes off my sister's cute bum and her little puffy slit I could see between her semi-closed legs. Mum came through and noticed my erection had returned from looking at my sister and she smiled and sat down beside me. Casually reaching over she starting stroking my cock for me smiling at me, after ten minutes of mum's gentle rubbing I could feel my balls boiling and I told her and she let go of my cock and it twitched about on its own. I sighed but mum had other ideas. "Sarah!" she said. "Your brother's got something for you." Sarah glanced over her shoulder and saw my towering twitching erection bobbing about. "Oh can I mum?" she asked crawling over on all fours her programme forgotten. "Careful," Mum warned her quietly. "He's close to popping." "Ok!" and Sarah gently cupped my heavy balls in her cool hand. "Can I see it spurt or can he put it inside me?" My cock twitched violently of its own free will like it was listening. Mum laughed. "I think let him spurt on you first then he'll last longer later." Sarah smiled and took a grip of my throbbing cock her tiny hand not meeting around the circumference. "Gently does it," mum encouraged her. Two minutes later. "Here it comes mum!" I gasped through gritted teeth. "Faster Sarah honey," Mum encouraged. "Don't let go and point it at your chest." I gasped and grunted and shot seven spurts of semi-clear liquid the first hitting my sister in the face the pointed my cock down more as she continued to rub me through my orgasm the rest coating her cute little chest and nipples, causing the little nipples to harden significantly. When I finished spurting I lay back and mum told her to stop wanking me. I lay gasping for air as Sarah rubbed the sperm into her lovely little body and mum licked her puffy nipples making her groan with pleasure. The next thing I remember was waking up on the settee with a towel over my waist and mum and Sarah watching a film both still naked. Sarah noticed I was awake first. "Mum he's playing tents again," she laughed looking at the towel bulging at my waist. "How are you Tiger?" mum asked smiling at me. "Okay," I said lifting the towel off my cock slapping my belly then springing up. "Must have dozed off." "Come on you two," said mum "Let's go upstairs and continue your education," The TV was clocked off and we didn't need telling twice we scampered off upstairs to mum's room which reeked of the sex earlier. We jumped on the bed my cock was so hard I nearly pole vaulted on. Mum took charge. "Billy I want you to lick your sister's pussy and make it nice and wet and make her feel good then I want her to climb on top of you and see if she can fuck you. Is that ok?" Is the Pope Catholic? Mum got my sister to spread her legs and fold her legs back so her pussy and bottom were raised up and I proceeded to lick and stimulate her little pussy and hard clit soon she was bucking and moaning and mum pinching her little nipples making her moan even more. She orgasmed so hard her pubic bone banged my nose but I hung in there and she had a huge orgasm and lay panting gasping for air. Once she had recovered mum got her to move around and got me to lay on the bed my cock sticking up proudly. Mum rubbed me for a minute then told Sarah to sit on my stomach and my cock brushing the crack of her tiny bottom causing vibrations along my hyper sensitive cock. "Now raise yourself up," mum told her. "And scoot back until your pussy is above your brother's cock." She did as she was told until I could feel her pussy lips on my cockhead. Mum rubbed my glands against my sister's wet pussy. "Now slowly lower yourself onto it," she told her holding my shaft at the base herself. Felt this most wonderful sensation as the first inch went in my sister gasping. "It's so big, mum," she gasped. "Do you want to stop?" mum asked her. My sister answered by sliding another inch onto me then we met an obstruction my sister's virginity. Mum explained the next part would hurt Sarah for a minute then it would be fine. Sarah nodded sweat dripping off her forehead onto my chest. Mum took both hand on Sarah's little bottom and pushed and Sarah squealed and I saw tears for a minute as she sank the remaining four inch's onto my cock. She lay panting on my chest now fully impaled on my 6" of cock. Mum rubbed her back and bottom and soon she came around and mum instructed her to start moving up and down. My cock felt wonderful sliding up and down her tight little pussy. Soon Sarah was getting really enthusiastic riding me like a cowgirl she came twice more and the last time I gripped her writhing bottom and held on and pumped for all I was worth until I felt myself spurting inside my sister. We lay back both of us suddenly aware that mum was having an orgasm as well her fingers diddling her own distended clit. "Wow that was so hot," she gasped after coming down from her orgasm. God! That was brilliant," Sarah sighed and I nodded. Soon we all fell asleep and didn't waken until the morning. I awoke to find my mum climbing onto my morning erection. "Morning son," she panted as she slipped my cock into her wet pussy. Within ten minutes she had orgasmed and I had come. Mum sat still on my still erect cock massaging my cock with her pussy muscles. Sarah had wakened with all the activity and wanted to join in so mum had her sit on me facing her and told me to lick Sarah's pussy which I did while she sucked her tiny nipples soon Sarah came and mum climbed off my erection and Sarah took her place gingerly. After fucking for about ten minutes with mum watching proudly she told Sarah to climb off as she wanted to show us another way. Reluctantly she dismounted my cock thwacking my belly. Mum arranged Sarah on all fours and told me to get behind her my cock sliding in the groove on Sarah's arse. Mum then took my throbbing cock and bent it down until I could get into Sarah's pussy from behind I took a hold of her hips and was soon pounding into her I played with her little rosebud at the same time probing it with a finger-tip at mum's instruction. Sarah came violently pushing her bottom hard onto my cock causing me to come again. Over the next two years we all fucked as much as possible and every weekend was a fuckfest from Friday after school to Monday morning quickie. My cock grew and grew and I was spurting ropes of thick come by the time I was ten. My flaccid cock now would hang down to almost my knees and an erection in my trousers was very painful. Mum and Sarah loved my giant cock and Sarah called it my swinging thumper. It was them Mum suggested that I should meet some of her like minded friends.