It's the fervor of Dove's begging, the utter helplessness in her voice that finally breaks her, and Rose's hips finally surge forward, slamming into Dove's ass hard as she blows her load with a strangled moan that's surprisingly girlish.

"Good girl," she croons lightly, "good, good girl." She drapes herself for a long moment over her sister's scrawny back, catching her breath, before Rose finally straightens, pulling out and leaving Dove's cunt a sticky, ruined mess. She reaches into her bag then for something to replace her; a metal bullet vibe, cold from the ice pack in her lunch bag, and without warning she presses it into the sopping mess of Dove's cunt, and pulls her ruined panties back up.