Spoilers for Buffy, in case you've never seen it. This is actually more of a Buffy prompt than an HP one; I'm gonna go look fora BtVS fanfic sub to cross post to after this.

I was just talking with someone about that scene in Buffy where all the high school girls are under a spell to be obsessed with Xander, and Buffy comes onto Xander really strong. We were talking about how it's messed up that he gets a bunch of kudos from her after for not taking advantage of her, even though that's basically thanking him for not date raping her. Like a really low bar. The person I was talking to said the spell she was under was kind of like what Merope Gaunt did to Tom Riddle Sr.

So I had this idea of a crossover where Xander does have sex with Buffy and she gets pregnant and has a Voldemort-type baby.

That's the extent of the idea. I might not post this if I weren't stoned.