Please Help

[I_Love_Sark]

the fic starts with Draco trying to play a prank on Hermone that would result in her upside down and naked as this "trap" only works on muggleborns. Snape notices but says nothing. When nothing happens both assume that the spell was cast wrong until colin runs in with a messege for Snape from the headmaster and gets caught. Curious Snape runs a lineage spell on her and finds out she is Vldemorts daughter. They start a romance after he informs her of what happens. I thin that this fic also involves very complicated courtship rituals and the fact tha McGonangal is her mother but I could be confusing it with another fic any help would be greatly appreciated... thanks

[Kyarorin]

The story is My Real Parents by redfrog.

http://www.fanfiction.net/s/3154117/1/My_Real_Parents