The Law of Big Tits and Big Tits Tonkotsu Kikinho, My Sister's Big Tits Moment is Not a Matter of Seeing it!
ชื่อเรื่องเดิม: CHRV-157 デカパイ万乳（ばんにゅう）チン力と爆乳トン運動法則 妹の爆乳モーメントは一見にしかず！Mカップ133cm ちーちゃん
My little sister has incredibly big tits, and all the boys who pass by her are glued to her eyes. Even though she is my brother, I am always staring at my sister's big tits, and I always have a hard-on. One day, in physics class, I mistakenly read the word "gravitational force" as "Man-nyu-chin-ryoku" (universal gravitation)...I see, I am not from earth, but from the boobster planet, so "Man-nyu-chin-ryoku" is fine!
