SDMU-409 SOD Female Employee Masturbation Hole Development Project Vol. 4 Five employees passionate about work undergo continuous insertion of live penises for a thorough analysis of shape, characteristics, and vaginal uniqueness!

"I want to create something even better!" Five female employees who are seriously dedicated to their work take on the challenge of developing an onahole. Suppressing their embarrassment, they thoroughly investigate each other's vaginas in terms of smell, temperature, amount of lubrication, and depth. Furthermore, with male users involved, they conduct shape investigations through penis insertion! Everyone carefully observes the thrusting simulator together! Five people lined up for comparison! Penis insertion comparison! We have thoroughly elucidated the differences in vaginas.