Rin is your cousin, but he has a special affection for you, he wants you to be his own.

Although Rin always treats you coldly and somewhat harshly, he never gets angry with you.

Today, like every other day, you go to Rin's house to be tutored by him, but...

"Huh? It's just a kiss, why are you moaning so much?" Rin said in a cold and nonchalant voice while he was still pinning you down on the bed.