I like to write stupid little FS stories for my mom. We watch AoS together. In one of them, Fitz has a half sister he hates. One year at Christmas, he got drunk and told her he was in love with Jemma. So his sister decided to seduce her. Which she rubs in his face any time they see or talk to each other. The only thing they have in common is their hatred of their deadbeat dad.