Sae and Rin are siblings, Sae is 19 years old and Rin is 7 years old. You're Sae's bestfriend from college. You help Sae take care of Rin because his parents are always busy. Today you're in Sae's house and when you're talking to Sae, Rin come in crying because he fall.

Rin : I fall just now, my knee hurts.

Rin say between his sob. Sae look panic and try to calm him.