For My Man, I just dive on Down and get to work. Sometimes, then he wakes up and has to pee, and that may take a while, if he's got hard. I can hear him getting frustrated in the bathroom, because he wants to get back to me, but needs to pee, too.
Sometimes just hugging, kissing and stroking him is enough, and he can pee before full Hard Mode happens.
I've actually TRIED to do this in the evening, if he falls asleep first (he always tells me one of his favorite things is to be woken up during a blow job) but at night, he sleeps like a log. I've gone at it for as long as 15 minutes with him snoring away. What a waste of half a boner.