I was out partying all night with a g/f once and, right after she had an orgasm from oral sex, she whispered, "I am SO horny - fuck me NOW," - and immediately passed out. I couldn't believe it - I was crouched between her legs just inches from paradise . . . . Needless to say, I was very depressed.
Not too depressed to obey an order, though
OK - just kidding - actually, I took matters into my own hands (after a somewhat lengthy battle with my conscience).
The next morning, she remembered what happened, and more than made up for it, and afterwards, we laughed about it. She did say, though, "Next time just fuck me anyway."