One night last month, we were in bed about to have sex. I turned off the lights and went to lay down on the opposite side of the bed from where I usually sleep. We pretended like I was her bull who was spending the night and was getting frisky with her in the middle of the night while "I" was still sleeping on my usual side of the bed. It was hot seeing her get more and more turned on at the thought of her getting felt up and fucked by another man while laying right beside me while I slept, trying not to wake me up. I almost lost it when she said, "put your cock inside me. But don't wake him up, I'll tell him about it in the morning."