Book 3 of The Legacy Series Sienna Martinez has known Liv Williams her entire life. She watched her grow up. Braided her hair before elementary school. Treated her like the little sister she never had. That's why this is so wrong. Liv isn't little anymore. She's eighteen, confident, and moving into the room right next to Sienna's for her freshman year at UT and she's looking at Sienna like she's been waiting for this moment her whole life. Sienna should walk away. Should keep treating her like Harper's little sister. Should ignore the way her heart races every time Liv smiles at her. But they're living together now. Sharing walls. Sharing spaces. And Sienna is running out of places to hide. Harper is Sienna's best friend. Has been since they were born. She trusts Sienna with everything including her little sister. If Harper found out, she'd never forgive her. If anyone found out, everything would fall apart. But Liv knows exactly what she wants. And she's not giving up. "You're my best friend's sister." "I know." Some desires are too dangerous to resist. [18+ sapphic romance | best friend's sister | age gap (22/18) | forbidden relationship | forced proximity | living together | slow burn tension | family dynamics | The Legacy Series - can be read standalone]