-Its an AU where a gay david married kurt's mother who already had kurt, i don't remember what happened to kurt's father, anyway i think kurt's mother left david because she knew he was gay.
-The day she left, she left kurt at school.
-David raised kurt.
-years later a teenage kurt fools around in their home and david who came from work catches them.
-Kurt wants david and he wants him as well.
-Kurt finally succeeds in making david lose control and make david sleep with him.
I'm sorry i know this isn't much but i hope anyone recognize it.
Link in the comments.