My Beautiful Aunt - Kayoko Hisakura

Wataru goes to his aunt's house, who lives nearby, to take care of a favor. Usually, his uncle is there, but today it's just him and his aunt. Wataru is nervous, but today his aunt is unusually touchy-feely, and Wataru finds it strange. When he tries to leave after finishing the errand, his aunt invites him, "Want to take a bath before you go?" As he gets in the bath, his aunt suddenly enters in a sexy lingerie outfit...