Lustful sister finds her brother jerking and seduces him

Mike furiously jerked his cock, when noticed that his sister stands behind him gazing at his stiff shaft and rubbing her crotch through thin strip of her sexy black panties. He tried to cover his cock with his hands, but she sat next to him and squeezed it in her fist. It throbbed in her hand, so she couldn't resist a sudden urge to suck it and thrust it in her mouth feeling his trembling hands running all over her sensitive body.