Guest or housemate masturbating while you have sex in front of them

What all happened? How did that whole situation come about in the first place?

 

Crashing at a friends house after a party, me and GF we on one couch, her best friend/room mate was on the other couch like 10ft across from us, lights are out my GF starts jerking me off then slips her pants down, we thing the friend is passed out, we start fucking then hear a noise and stop, start again another noise and stop and so on. Few days later my GF says her friend confessed she'd woken up to us fucking and rubbed one out as quietly as possible

 

Me and an old gf gave a friend of hers a real show, of us having sex she watched and wanked to us, apparently she had accidentally caught someone getting oral sex and got very turned on by it.

Another occasion when me and a good mate were wanking to some porn his gf walked in on us she sat on the sofa in the other walk, and told us to carry on, she asked if we would wank each other he was very keen and I went along, after a little while she called him over and started sucking his cock, and then sat him down and rode him so I had a good view while I wanked off

 

I’ve watched people quite a lot tbh and always gone to town over it in the moment

 

Love to hear some details

 

I’ve never done this, but I know what I would do. If I hear a friend having sex outside the door, I’d put my ear as close to the door as possible, pull out my dick and stroke hard.

 

A couple of my friends beat their dicks when I was fucked by an older boy. It happened a few times.