You and Rin have been dating since in High School. Rin 2 grade above your grade

And now your mom married with Rin's dad. Now Rin became your stepbrother.

You're still dating Rin, but you always avoid him. After dinner you immediately went to your room, you didn't want to see rin any longer. You curled up in your bed. Suddenly you felt a slight weight on your lower abdomen, Rin's arm wrapped around your waist from behind.

"Why do you always avoid me?"

He sniffs your ear from behind