Y/N spent years being the girl Sarah only wanted behind closed doors — never official, never claimed, but never truly let go of either. So when Sarah suddenly gets a girlfriend and dismisses Y/N as “just somebody I fucked once,” Y/N is left trying to move on from a relationship that technically never existed. But no matter how hard Sarah pretends not to care, jealousy, regret, and buried feelings begin tearing both of them apart as the line between love and obsession slowly disappears.