OFTR-014 · Bound Piston Vibe: No-Screaming Endurance Game

Can they endure a slow attack from a piston vibrator on their defenseless pussies while bound without making a sound!?
In this game, amateur women who were approached on the street and are in need of money participate. There are three challenge stages, each lasting 10 minutes. Vibrators that gradually increase in size are attached to a piston machine to lewdly stimulate the ladies' pussies with slow pistons! If they can endure without letting out a single sound, they win a prize of 1 million yen!
The three participants this time are: Mizuki-chan (28), a fair-skinned office lady with beautiful legs and big, cute eyes; Natsumi-chan (24), a tall sports instructor with a nice body; and Sanae-chan (25), a petite girl with explosive tits and short black hair who works at an izakaya!!
A bit confused by the lewdness of the game!? But for 1 million yen, they brace themselves and head to the piston machine! Bound by their hands and feet in an M-shaped leg spread, and with plenty of lotion applied down there, the vibrator slowly slides in and out of their pussies! Sometimes it inserts deep inside! Do they accidentally let out a sigh...? "This... it's hitting the back..." A lewd slow piston that teases them! The vibrators get bigger with each stage cleared! Mizuki-san, whose sensitivity skyrocketed as she reached her limit, had her beautiful, soft breasts massaged relentlessly and screamed during intense pistoning, reaching climax and being disqualified!! "Ah, this is bad..." Natsumi-chan, who was too sensitive and suspicious from the start, failed her challenge, but in a "cry-me-a-river" bonus round, she was given a real big cock slow piston and naturally... moaned uncontrollably! She came repeatedly, her beautiful nipples standing hard, reaching climax over and over! Sanae-chan, with her beautiful smooth pussy, showed confidence with a smile, but... she was helpless against the extra-thick vibrator! She screamed and failed the challenge! She tried again in a bonus round, but her breasts were too sensitive; they were massaged and licked relentlessly, making her scream and resulting in game over! Finally, since her sensitivity was already peaked and Sanae-chan was in full erotic mode, they jumped straight into an orgy stage!! Surrounded by real cocks, both her upper and lower mouths were filled with dicks!! She felt amazing, screamed without holding back, came repeatedly, and even got creampied over and over—thank you for the ultimate climax experience!! Although she made noise, Sanae-chan continued to challenge brightly and energetically, accepting our cum with a smile, so she got to take the prize money home!!! Happy ending!!!