[LULU-406] I was unknowingly seduced by my girlfriend's slender, JK-type sister's radical swimsuit, and I couldn't resist, so I put my fully erect dick through her high-leg bra and rubbed it against her... and then I slipped it in raw! After (Censored)

When I met my girlfriend's younger sister for the first time, she was apparently a J-girl model, tall and slender with an irresistible body. When she showed me the swimsuit she'd been asked to wear for work, it was a radical high-cut swimsuit! I was overcome with the urge to see her in it. I sneaked into her house and spied on her trying it on, but just watching wasn't enough to get my dick riled up! After practicing the photo shoot and posing...