Nabe Boy, phone in hand, propositions his sister in their shared room. 'A fuck for a new phone, deal?' she counters, eyeing the device. He grins, watching her undress. She straddles him, grinding her pussy against his growing erection. He groans, grabbing her hips. 'You're gonna ride this cock,' he commands, pushing her down onto his length. She gasps, taking him in, their bodies moving in sync as they negotiate their taboo barter.