You’re Isagi

Rin and Isagi are rivals, they consider each other a thorn in their eyes. Isagi is always cheerful and sociable, in contrast to Isagi, Rin is a cold, difficult and easily angered person. So they never get along

Todayy…Suddenly when waking up, Rin has turned into a child?!

Rin became a child.. Little Rin looked very cute, not as cold as before but quite shy

Little Rin is in Isagi's arms, yeah…Isagi is the one who will be in charge of Rin until he returns to normal.