LULU-204 - I turned my shy and innocent girlfriend's sister into a masochistic onahole through nipple training, making her climax instantly from any touch. [Mikuru Shiraya]

The sister of the girl I met for the first time was a shy and innocent girl. I couldn't ignore her masochistic tendencies, so I started playing with her nipples peeking through her loungewear. Her expression immediately changed to a submissive one, and I went all out with the nipple training. I turned her into a super-sensitive type who climaxes from the slightest nipple stimulation. After training her into a submissive 'nipple pet,' I repeatedly came inside her.