The younger sister, who is always made fun of for having small breasts, has been waiting for a chance to retaliate against her older sister! One day, she finds her sister sleeping at the entrance late at night! She secretly tweaks her nipples and gets a surprisingly sensitive reaction! The next day, while her sister is on the phone with her boyfriend... When my nipples are flicked and licked like that, my sister's tongue technique makes me cum in an instant! My sensitive-nippled sister was masturbating her nipples in the bathroom when my little sister barged in! Laughing, she plays with my sister's nipples, developing them every day! The younger sister tormented her overly sensitive older sister with various plays like backrest pressing and ice torture, but in the end, it was the older sister who... the younger sister's nipples.
