[MIMK-300] Thanks to his big cock he achieved flirting and cheating sex with the top-caste gal who has a boyfriend…!

Shiina, a popular gyaru with a boyfriend, grows dissatisfied with the small size of his penis, while hearing rumours about how the quiet nerd from her class possesses an unusually large one.

She boldly propositions him for a secret affair to experience a bigger dick, proceeding to have sex in the school toilets.