A story about a big-butted athlete from a prestigious track and field club who has her anus developed by her coach and falls deeply into the pleasure of her asshole. The training to strengthen her lower body imposed by the horny middle-aged coach is a 1cm air chair training straddling an erect dick! Despite being covered in sweat and her legs trembling, she manages to keep her legs spread wide, but she can't stand it and is rawly inserted into her anus! Her asshole is violently thrust and piston-pumped by the coach's throbbing dick waiting below, and she has a convulsive orgasm in her ass! She falls into anal pleasure with non-stop creampie piston pumping even after cumming many times!
