We've all had the odd time (the heat, too much to drink, general tiredness, maybe impending illness) where we couldn't perform. It happens, but it's still possible to provide her with a lot of very focussed pleasure, even with a limp cock.
Not quite a 'flop', but quite recently I had her revved up for a bit of anal, about to sink it into her, when her talk -which was turning me on spectacularly- all about 'up to the hilt, baby, and fill my little asshole with your cum' sort of chat, had me shoot my load off all over her backside, down her legs, over her feet
I was giving myself the odd stroke whilst readying her for rear entry, but still...I didn't think I was remotely close to cumming. All that was needed was a few choice words and it was blast off.
Still, she licked dry what was dribbling and then I set to work on her with my tongue instead. Much queefing was also taking place