MIAB-577 My brother-in-law's favorite food was my nipples... He'd been watching my breasts grow since I was a child, and he'd been teasing me until I'd cum from my nipples... Karin Kitaoka

[I want to play with Karin's hard nipples!] When she was a child, her parents remarried and she got a new step-sister. They got along well and became like real brother and sister, but... as her breasts gradually grew and expanded, her brother became excited and began observing them. He then peeked at her hard nipples and felt the urge to touch them explode! He couldn't resist and started playing with them, and she started thrashing around, screaming "Big brother, stop it!" But seeing her sensitive nipples twitch with each stimulation made his sexual desire run wild! He couldn't stop and escalated into nipple-tweaking sex! The pleasure was so intense that she came over and over again, and the sister accepted her brother's dirty sexual training. "I'll help you grow into a premature ejaculator who can cum so easily!"