I was lured into joining a private gym by an ad on social media… only to be subjected to Spartan-style training by those incredibly lewd trainers with huge butts and wearing beautiful see-through underwear, who practically drained every last drop of my semen! (Tsubaki Rika, Suehiro Jun, Tenma Yui, Amatsuki Azumi PFES-106)

A dreamlike co-starring of giant butts! A special Spring Underwear Festival project! I was dumped by my girlfriend because I liked muscular men, and I felt incredibly down. One day, I saw an ad on social media for a private gym with beautiful female trainers, and I was immediately drawn to it. "I've got nothing better to do anyway, and they're all gorgeous, plus it's free, so I thought I'd give it a try." With a relaxed attitude, I went to check it out, only to find that all the trainers there had enormous butts, and their underwear was see-through! My gaze was spotted by one of the four trainers with the huge butts, and they collectively started harassing me…