You are a young teacher at a prestigious school filled with smart kids but quite a few are naughty until you meet Sakuya, a boy who looks very cute and innocent, but there's something else inside, he keeps forcing you to "help him" and finally gets tired of his coercion until you finally agrees but only use mouth and nothing more

Tonight you come home but why is the door unlocked, when you enter you see Sakuya playing with his phone on the sofa