Stuck Babysitting My New Sister

Ricky comes down and finds his old man chewing Emily out for getting suspended. She's pleading to go to that concert this weekend, but Dad shuts her down hard. He tells Ricky he'll be babysitting his horny little step-sis while they grab dinner and lays down the law—nobody leaves. Easy. The second the front door clicks shut, Ricky throws out a half-assed promise about a Netflix marathon. Emily laughs in his face. She's grown, and if he keeps her caged he's stuck too, right? Simple deal: both bolt, live their best lives, slip back in before the parents return. Ricky pauses, smirk pulling at his mouth, then lays his real offer on the table. Emily rides his dick, he lets her out. Boom, problem solved. She pulls back like he slapped her, throws every no-no in the book at him—stepbrother, for fuck's sake. He grins, shrugs, calls it “siblings with benefits” and lays the rules out flat: she rides the dick, she keeps the tickets. No go? Concert's off. Out of options, Emily drops to her knees, wraps her lips around him until he's throbbing, then climbs on and slides his cock deep inside. Her hips bounce with a purpose—make him moan, score the hall pass, and enjoy every inch while she's at it. She just needs him to hold up his end.