My late wife and I had done a bit of same room soft swapping now and again, but not full sex.
We went to a party one evening, not a sex party as such but played a truth or dare game, the women had to flash their tits and the guys show their cock. This one guy was a mobile hairdresser and had to show his cock, he was very proud to do so as it was a big one , only semi-hard but very thick, put all the other guys in the shade.
When we got home we both needed urgent sex, and while fucking I asked my wife if she wondered what his fat cock would feel like. I felt her juices gush as I spoke about it.
For the next few weeks she told me she masturbated while imagining being fucked by this guy.
One night in bed I asked her if she would like to be fucked by his enormous cock for real. She said of course but only if I was ok about.
I told her the best thing to do is to make an appointment to have her hair done by him, and as he is a known womanizer there's a good chance he will make a move.
The only rule was she had to tell me full details of what happened and not to shower after anything they may do until after I got home.
The day came and It was on my mind at work all day thinking of what they would be doing.
When I got home I was shaking with anticipation, I called out, she was upstairs laying on the bed with a sheet over her but naked underneath, but her hair looked good.
I said come on tell me if anything happened.
When he arrived he had to wash her hair in the bathroom
She had on a T shirt no bra great tits that stood out well without a bra and loose flared skirt silky French knickers. she knelt over the bath while he washed her hair, she felt him stroking her neck more than a hairdresser normally would and told him that feels nice, that encouraged him and started to caress her bum then slid his hand under her skirt and inside her knickers, her cunt was dripping wet by this time, he slipped his fingers inside her felt for her tits and played with her nipples.
She put her hand behind her and felt for his cock he had jogging pants on and they were bulging ,his cock felt enormous and fully erect not half hard like at the party.
He put a towel round her head and she led him into the bedroom.
By this time they were both mad for it and tore their clothes off , she said she couldn't believe the size of his cock, about 9 inches and her fingers wouldn't meet around it. he was going to get on top of her but she said no way not with that monster, so she climbed on him and gradually lowered herself on his cock , it was spreading her cunt apart like never before, but eventually he got it right in to his balls and started to pump in and out.
They turned over she pulled her legs back to her tits and he slid back in her, she was cumming one after another and her juice was soaking the sheets.
They finished with her on her knees and fucked her hard and shot his load high around her cervix.

She put on a tight pair of knickers to hold in his spunk for me when I got home, he finished her hair and left she laid on the bed for an hour until I got home. I undressed and laid down beside her while she told the whole story. My cock was bursting I pulled back the sheet opened her legs , her cunt lips were red and the aroma of a well fucked cunt was so horny ,I licked and sucked on all that juice and spunk then slid my cock in her cunt so silky smooth sloppy seconds, I became almost addicted to sloppy seconds. this carried on every month for almost two years until we moved away from the area.
Fantastic Memories from almost 30 years ago.