[Chinchintei (chin)] Akutoku Fitness wo Torishimare!

Busty fitness instructor Sana takes pride in her gym until a sleazy, overweight old consultant muscles his way into her business, blackmailing the sweating teacher into obscene 'private lessons' where his wandering hands grope her huge breasts and plush thighs through a skimpy leotard. Telling herself it's all to protect the gym, she endures his chikan-style teasing mid-class, then spreads her legs for his thick cock and convinces herself the sex means nothing even as her body betrays her. One month later the gym is thriving, and the once-defiant instructor eagerly services her 'consultant' with drooling paizuri and more, a tomboyish princess thoroughly broken in.