My wife and I are friends with a lesbian couple. I know from (not so) subtle body language hints that they've both imagined what she looks like under her clothes. I like to think that sometimes when they're licking each others' pussies, they're both imagining that the other is my wife
A few years ago, we stayed at their house for a week. We were in a blow-up bed in the lounge.
It was July and so quite hot; we were on vacation and so had spent most of the day drinking.
She would never normally do this, but because it was hot, and because she'd loosened up quite a bit, she decided to sleep nude.
I got up in the middle of the night to pee, pulling the covers off us both. I was expecting this to wake my wife up as she's normally a light sleeper, but due to the alcohol she was completely out.
She was sleeping on her side but had her legs split apart, so her butt and pussy were completely exposed.
I left the covers off and went back to sleep.
When I woke back up again the covers had been pulled back up, but the though that she had been exposed drove me wild. It was a studio apartment, so if either of our friends had left their room to go to the bathroom, they would have seen her exposed bits. I like to think that they did this while we were sleeping and maybe got a few sneaky pics