A curious twink doctor-to-be, eager to explore his sexuality, finds himself alone with his sister. Unable to resist the taboo allure, he gently guides her hand to his growing bulge. She hesitates, then tentatively strokes his throbbing cock through his scrub pants. His heart races as she unzips him, revealing his hard, uncut twink dick for the first time. He teaches her how to jerk him off, his moans filling the quiet room. She's hesitant but eager, and he can't believe how good it feels. His medical training kicks in, and he guides her to suck him, pushing his hips forward as she tentatively takes him into her mouth.