I Mistook Him for a Man, but the One Who Claims to Be My Underling and Is Absolutely Obedient Is Growing Into a Filthy Onahole Body Day by Day, But...

男だと思い込んでいた俺に絶対服従の自称俺の舎弟が日に日にドスケベオナホボディに成長していくのだが、、