MIDV-615 Nao Jinguji gets her lewd older sister to submit in an obscene costume

Nao Jinguji plays the older sister who mocks her younger brother, then finds the tables turned when he demands obedience after acing a test. With their parents away for three days, he plans to put her in a revealing cosplay outfit and make her cum. What starts as sexual harassment training with pacifier commands turns into rough back-piston action and ends with an orgasm creampie, as the sister slowly gives in to the pleasure.