When it takes me a long time to come. This never used to happen and now I go through cycles where it happens, followed by cycles where it is more easy. I always feel he's going to get bored waiting for me to come (and he has been known to fall asleep, thanks for hanging in there, guy! Although he usually wakes up after dozing for a few minutes.)
The other night, I at first felt bad because it took me at least a half an hour after
we grabbed the big vibrator. Then we messed around for at least half hour to 45 minutes after I came, then he needed help and he got oral sex for..... 90 minutes. I wasn't going to give up on him. (I didn't fall asleep either, although I was pretty tired.)
But, for me, I feel better when I can come easily. Oh, to be 25 and come easily....