Chapter 1

When I got home, Abi was there waiting for me, sitting on my mattress in the hall at the bottom of the stairs. She’d obviously had a shower, as her hair was still damp, and she’d put on some shorts and a T-shirt, and I could smell some nice perfume in the air.

“Everything OK brother?” she asked. “Yes, great!” I said, “Anne and Susan came back to Susan’s car, then they had a big argument, then Anne told Susan that she never wanted to see her again!”. Abi grinned, “That’s brill, but...”, “What?” I asked. “Do you think that Anne really does want to see us again?”. I grinned “Oh, yes, she says that she just can’t wait!”. Abi smiled.

She shuffled off the mattress and knelt in front of me looking up at me with her oh-so-innocent schoolgirl face, then she ran her hand up the outside of my trouser over the outline of my cock. “We did some very, very dirty things today brother, didn’t we?” I nodded. “I absolutely loved every dirty second of it, and the perverted things we did were SO exciting!” she gasped. My cock instantly began to swell at the thought of what we’d done, which made Abi giggle. “Oooooh, are you getting excited again brother?”, she said with a wicked twinkle in her eye. I nodded and reached down to pull my zip down so that Abi could get my cock out, when we both heard the sound of the front door to the shop opening. “Hi kids!”, came our mother’s voice, “I’m home!”.

I was sure that I still might have some dirty stains around my face, or might still bear the aroma of the dirty liquids and solids we’d been playing with, so I scooped up my backpack and some clean clothes off the drawers by my mattress and ran up the stairs to have my own shower as Abi shouted back “Hi mam!”, just like she’d had an innocent school-girly day playing games with her friends, when she’d really been doing very, very adult and perverted incestuous things with her big brother:-)

Both mam and dad were in for the rest of the day, so it wasn’t until later that evening that Abi and I got the chance to talk again, as we headed out to give the dog a walk before bed. We headed back to the building site where the the day before last’s excitement had happened, and we soon found a half-built house to do some exciting things in while we ‘talked’. I was sitting on builder’s saw horse, wearing no shorts or pants, and Abi was kneeling in front of me slobbering her mouth up and down my very stiff cock, occasionally stopping to tell me her thoughts about what we’d been up to earlier.

“I love piss and shit and spunk!” she gasped as she paused from her cock sucking. “And it was just amazing to watch Susan and Anne doing those dirty things too, wasn’t it?” She wrapped her lips around my cock again as I said “Oh yes, it was all very dirty and exciting, and I just loved how much you enjoyed trying shit sex for the first time, and how we’ve now got a new friend to try things with!”. Abi sucked hard on my cock before pulling it from her mouth again. “I never thought I’d ever have sex with another girl, but watching Anne sucking Susan’s cunt and drinking her piss, then watching her lick piss and spunk and shit out of my dirty cunt was such a thrill, and I want to do more!”.

“What sort of things would you like to try next Abi?”, I asked. She looked at my, sort of shyly, and then said, with her hand firmly wanking her own’s brother’s cock, “I want to feel the excitement as I look forward to you slipping your lovely cock up my bum for the first time, then I want you to give me a really dirty bum fucking while I play with myself, sticking my fingers up my own cunt just to be sure that you’re really fucking my dirty bum hole. Then I want you to take your cock out so that I can suck it, straight after it’s been up my bum”.

Well, that sounded more than alright to me! “How dirty do you want it to be Abi?”, I asked. “Oooohhh, very dirty indeed brother! I want to know how it feels to have you spunk up there, and I want to plan a session where we both know that when you fuck my bum your cock is going to be going into fresh hot shit up there, then I want you to spunk inside me so that I can taste my own shit and your spunk straight off the cock which has just been fucking my dirty anus”

A thought occurred to me. “Should we do that on our own, or would you like Anne to be there too?” A big grin lit up Abi’s face, “Oh yes! That’s what we’ll do on our first session with just the three of us!”. I grinned back, asking “Do you think that she’ll help me get my cock up your bum for the first time so that I can give you your first bum-fucking?” Abi grinned again. “She’ll probably want to lick my bum and stick her tongue up there first, which will be really dirty!”.

“Is there anything else you’d like to try Abi?”, I asked. “Would you like to watch me do dirty things to Anne brother?”, she said before slipping her mouth back onto my very stiff cock. “Hmmm, that would be very good Abi! What sort of dirty things do you have in mind?”. Abi wanked my cock as she slipped her lips up and down the length of my straining cock, making me gasp, “Well, I really enjoyed watching Susan fisting Anne’s cunt, so I really want to try doing that to her, as I’ve been thinking about how good it will feel to have my hand right up inside another girl’s cunt. Would you like to see that?”, I nodded enthusiastically, “I was also wondering if you’d like to watch me lick a girl’s cunt for the first ever time?”, again I nodded, as she sucked the head of my cock like a lollipop, before swirling her tongue around the head. “Would you like to hold her cunt wide open and then watch your little sister sticking her tongue deep up inside another girl’s vagina, to slurp up her dirty juices and feel how the inside of her cunt feels on my tongue?”, phew!