Boredom turns into forbidden pleasure when Ayumi, M-kun's girlfriend, relaxes at his place. Unbeknownst to her, he sneaks up, his massive cock ready. In one swift move, he penetrates her from behind, catching her off guard. Her tightness and his rapid thrusts send shockwaves of ecstasy through them both. Ayumi's moans fill the room as M-kun's pace quickens, their bodies slapping together in a rhythm of raw desire.