Shota's heavily pregnant wife has been staying with her family for a week, leaving him home alone and worried about her. Her older sister Ranka suddenly arrives to cheer him up. “You haven't fucked her since she got pregnant, have you? I figured you must be backed up.” Stunned by her blunt offer and powerless against her gorgeous tits, tanned skin, and stunning figure, Shota spends the next night and two days being ridden and drained by her.