Trixie's Funhouse is a fanfic that Mike read. It is based on the show My Little Pony: Friendship Is Magic
Trixie says she can help the Cutie Mark Crusaders get their cutie marks if they go into her house. They follow her into a warehouse far away from the town. Inside there she brutally rapes and tortures the three ponies. They are eventually all killed and she tells Rarity that her sister is "taken care of".