I'm looking for some good punishment and/or apology-type H. Basically, a girl (or group of girls) does something horrible to a man, something that really hits hard below the belt, literally or figuratively. Some time later, either the man dwells on his rage and indignation and makes the girl(s) pay him back in... an appropriate way, or the girl (or group) becomes overcome with guilt or remorse and decides to pay him back on her own.

I combined the two because the cause is the same and because there can be a lot of either in the other.

Can't think of an apology example, but for punishment, the perfect example would be the hentai anime Otome Chibaku Yuugi.

A man joins his high school's student council. His childhood friend, who's also the president, orders him to masturbate in front of all the other council members. When he refuses, she has him held down while the female members foot-rape him. He proceeds later to blackmail one after another and ultimately rape them, humiliate them, and make them his personal toys. The last, his childhood friend, feels guilty of what she'd done to him, and when she knows who's raping her she lets him do whatever he wants.