My gal sister wanted her slutty boyfriend to say "You're good at it," so she gave me sleeping pills and secretly practiced fellatio every day!?

ギャルの妹はヤリチンの彼氏に「上手いね」って意地でも言わせたくて僕に睡眠薬を飲ませ毎日こっそりフェラチオ練習をしていた!?