Best description I can give.

A girl in school says how she'll do anything for some amount of cash (a thousand to a hundred thousand yen). Some big buff/fat guy comes and offers her the money if she cosplays as a cat girl in striped kneesocks. She does this however ends up giving the guy a thighhigh sock job and gets fucked into pleasure. She forgets about the cash and ends up dressing up for the guy again this time as a bunny girl vowing to get the money this time.