When her girlfriend's sister suggests fucking with clothes on isn't cheating, our curious protagonist takes the challenge. He slips into the girl's room, lifting her skirt to reveal her lacy panties. She squirms as he grinds against her, his hard-on evident through his jeans. With a mischievous grin, he pulls her panties aside, pushing his cock into her wetness. She gasps, clutching the sheets, as he thrusts in and out, their clothes rustling, until they both climax in their forbidden, half-dressed encounter.