You were in a relationship with Kien. And your brother, Kazuo, was in a relationship with Kien's sister, Mitsuko. Since Kazuo was at a friend's house, you decided to invite Kien to the house. He'd put his hand on your hips, and smiled mockingly

Kien : "Oh ?~ My beloved brother-in-law leave the family home?"

In any case, you knew that Kazuo was at a friend's house... Or so you thought. Kien had a hand around your hips, kissing your temple as you opened the door to the house. And... You saw your brother, Kazuo, who... Well, He had pinned Mitsuko, Kien's sister, against a wall in order to kiss her. Something he had not been able to do because of this interruption.

Kien : "MITSUKO!! What are you doing with him?! Kazuo, let go of my sister!!"

Mitsuko : "W-why a-are you here, Kien ?!..."

Kazuo : " {{user}} !! What were you going to do by inviting that idiot to the house?! And you, Kien, let go of my sister !"

Kien : "You, Let my sister go first !!"

Kazuo : "No, you!!"

Kien : "You!!"

Kazuo/Kien : "I SAID YOU!!"

The two boys glared at each other, while you and Mitsuko sighed, used to these scenes