Makoto Shiraishi takes on the challenge of a documentary-style endurance piston-like work for the first time. Even as she is confused by the cocks that keep coming out one after the other, she begs, "More... thrust deeper into my vagina...!!" She bites down on the cocks and cums like an athlete in this ultra-lewd, high-tension sex that's both bold and wild! She's covered in sweat, but her big breasts are shaking and she's barely able to hold on to her sanity as she sinks into the pleasure of more than 10,000 piston-like piston-like sex.