SDMM-166 - Magic Mirror ship, the more you row, the stronger the vibration becomes with a heavily modified electric massager - mannequin challenge! A sensitive area is stimulated, and he struggles to endure while his girlfriend has sex with another man in front of him.

New project - Mannequin Challenge! Four amateur college couples who desperately need money challenge. If they can remain motionless for 5 minutes while wearing a heavily modified electric massager linked to a bicycle pedaled by the boyfriend, they win a prize. The sensitive area of a highly sensitive college girl is intensely stimulated, and she can't bear it, twitching...! She moans and leaks fluids while having sex with another man in front of her beloved boyfriend! (Note: NTR is a specific trope and is preserved as is)