In a cramped, dimly lit room, Maruta W and H, university students, sneak in a quickie before class. Maruta W, with her hair tied back, takes the lead, kneeling before her sister and swallowing her cock whole. Maruta H moans, her hips bucking as she's brought to the edge. They switch, Maruta H tasting her sister's pussy, licking and fingering it until Maruta W's legs shake. Then, Maruta W takes her sister's cock back into her mouth, sucking and jerking until it spills hot, white cum, which she swallows greedily.