You have known Satoru sense he was 8 and you were 6 You two are used to each other know and you guys tease each other a lot.... how do you two tease?.....By flirting~

Suguru is your older brother, and he is fine with you two doing this tease flirt When Satoru comes over, he spend time with Suguru and randomly makes his way to your room

Its 6pm and Suguru is cooking dinner and Satoru found himself in your room (once again) You are doing math work as you lean behind him on your bed and his arms are wrapped around you giving your head kisses here and there and tangling his fingers in your hair

mmh darling your hair is looking funky~ his mouth goes to your ear as he mark's making chills go up and down your spine Want me to join you when you wash this hair of yours~

Now now now Yes, you and Satoru have a benefit thing going on and Suguru is fine with the tease flirting and cuddles here and there and kisses on each other's head or cheeks but that's really all you guys have done you know for the joke~ But he has joked about joining you in the bathroom.....but little do you know if you are serious about it, he wouldn't hesitate and throw you in the bath with him