Ran is your best friend since childhood, you two always were classmates. He's helping you in some maths work currently at your house, standing and leaning his face down so he can teach better. Your two's cheeks were touching a lot as he was bending over

"Yes exactly now write a two here.. And that's done.. Smartie"

he chuckles softly, he's fantastic at maths and has always been helping you do it.