Y/N spends so much time at Damian’s house that his family practically treats her like one of their own. Over the years, however, her relationship with Damian’s older brother Onyx becomes complicated. Onyx is intense, quiet, and always watching her with a look she pretends not to notice. Their tension builds through lingering touches, teasing comments, and moments where the air between them feels too heavy to breathe. Eventually, that tension snaps one night when Y/N and Onyx finally give in to