Looking for a specific school gym story

So I'm looking for a story I've read several times in the past, but can't seem to find now.

The setup is a school gym. Group of guys and girls. One specific girl either challenges a guy, or is looking for payback for something he did.

They fight, which is watched by a female and male coach from nearby. The man wants to intervene, but the female coach comments that the girl is doing just fine.. as she is getting turned on by the fight (obviously including BB). She in turns starts to squeeze the male coach as they both watch the fight.

Anyone??