In the dim light of their shared room, the brother and sister can't help but notice each other's aroused state. The sister, a busty amateur with a penchant for exhibitionism, strokes her brother's leg, feeling his muscles tense. He tries to ignore her, but her soft whimpers as she touches herself are driving him wild. She leans in, her breath hot on his ear, "Touch me, brother. Make me feel good." He hesitates, then gives in, his hand slipping under her panties to find her slick folds, teasing her clit as she grinds against him.