[Sentaro]

Rin's smirk grew as he saw his brother's concentration decrease. It was a lot of fun to tease his younger brother and just look at him was nice. Maybe a bit weird that Rin was thinking about all the places where those pretty black dots would hide on Yukio's body.

At some point he stopped at his brother's butt. There had to be some too. "Do you have moles on your butt?" The blue haired male suddenly blurted out as he didn't show any sign of embarrassment. Weirdly he was easily flushing red but he didn't gave it that much thought at the moment as well he just ignored Yukio's request of not staring at him anymore.