Dave and Blaine's father are business partners (and scientists of some sort, I think) and they take Dave and Blaine on father-son getaway bonding trip, where they basically force hormone therapy on both, so that Dave is MANLY straight and Blaine is forced to become a woman. Towards the end Dave and "Elaine" meet Kurt and "Elaine" is pregnant and they tell Kurt that Blaine is dead.
P.S. I know this is basically a blasphemy in this fandom, but I'm looking for Anti-KURT fics, preferably Blainofsky. But any Blaine-slash fics with KURT-bashing are okay.