The house is quiet, too quiet. Michelle, her heart pounding, hears her brother's heavy breaths from the other side of the wall. She imagines his cock, thick and hard, mirroring her own arousal. She touches herself, her fingers slipping into her tight, wet cunt, as she pictures him doing the same. The tension builds, their shared desire hanging heavy in the air, until they finally give in, their mutual masturbation echoing through the silent house.