Buck has been keeping a secret from the entire 118 since the moment he first joined - he has an adopted daughter. Oh, and him and Eddie have been dating for 7 years. Buck adopted Y/n when she was ten years old, after he moved to LA for a new start. Buck and Eddie have been secretly dating and co-parenting Y/n and Christopher, but now Y/n isn’t a kid anymore and she wants to be a firefighter. Overprotective Buck and Eddie eventually agree to let Y/n start training, on one condition - that they can secretly get Bobby to accept her into the 118 where they can keep their eyes on her. Y/n is 19.