The room echoes with the sound of flesh meeting flesh as the girlfriend's fist connects with her boyfriend's throbbing erection. Her punches are precise, calculated, each one a testament to her desire to control his pleasure. She varies her technique, sometimes using her entire hand, sometimes just her fingers, each change eliciting a different response from her lover. Her own body responds to the power dynamic, her pussy growing wetter with each impact, her nipples hardening against the fabric of her top. She can feel her boyfriend's body tensing, his orgasm approaching, and she redoubles her efforts, eager to push him over the edge.