All sexual activity in this story is between persons having reached legal age.
I'm Terry, when I was twelve Dad, Mike, caught Mum, Anita and forty-one, fucking the neighbours son, Alan, in the marital bed. Dad divorced her, I remember the rows for a while then he left and moved on. The neighbour happened to be eighteen by two months and Dad got the police involved, how long it had been going on for was his word against theirs and of course they denied doing anything illegal. I believe the first time was at his eighteenth birthday party but at the time I had no real idea of any of the true details.
The genuine explanation given to the police for Alan's frequent visits to the house was helping Mum run her sex aids party business, very much on the lines of Anne Summers, by computerising the business for her. In the early days he was using a Sinclair ZX81 which lived with us as he had upgraded to a Spectrum. He also spent a fair bit of time with me teaching me how to use the computers and playing the games loaded using a cassette recorder.
Six months after the divorce he moved in to our spare room but it didn't seem long before he moved into Mum's bed. They didn't last long, probably about three years, and he moved out to a first floor flat in the next street.
I'd spend a fair bit of time in his flat playing on the computer and the frequency increased considerably when he purchased a Commodore Amiga 500 and then an Amiga 1200 with twin floppy and a hard drive. I became a bit of a whiz kid and between us we wrote some neat games and even had some published in computer magazines. Fridays and Saturdays we'd do things late into the night and I'd often stay over, sleeping on his sofa.
Jane arrived on the scene, I guessed Jane was several years older than Mum and while I was pounding the keys in the main room Alan was pounding Jane in the bedroom and sometimes it went on for hours. As the bathroom was off the only bedroom I'd just walk past them if I needed a piss even while they were at it. They'd always be under the covers so I'd never actually seen what they were doing but it was bloody obvious they were fucking.
Mum did a decent coming of age party for me on the Friday night, then the following day I spent a lot of time developing a new game with Alan. About six pm I went for a piss and found a totally naked Jane on all fours on the bed and an equally naked Alan standing beside the bed making Jane's very adequate hanging boobs giggle and shake as he fucked her. It was somewhat of a surprise to me as they had always been well covered under the duvet before then.
I stopped and watched for a minute or two before emptying my bladder and then again after doing so before returning to the 'goto loop error' in the programme. A few minutes later Alan returned to the main room wearing only Y-front underpants and a navy blue nylon vest to continue debugging the programme with me. Not a word was spoken about watching them or what they were doing.
Just before midnight I needed another piss and headed for the bathroom, Alan and Jane were watching the TV weather but at the same time I could see they were humping under the covers. On my exit from the bathroom she was laying there without the duvet, naked with her big tits laying over to one side, stroking her pubic hair and one knee raised. I looked as I passed her but she pulled me backwards onto the bed, then Jane stood and pulled my shorts and underpants down my legs to reveal my erect six inches. Pushing me onto my back she straddled my hips and impaled herself on my erection. Jane bobbed up and down on me for a few seconds until I shot my load.