It's just old bean paste from inside the body.Yuuuuuu~n ♡
It's the first time for Reimu you know!Reimu! It's badYuooh! Reimu-Woke upPatche...The sky...Wefweshed Reimu, first time in whole yu-lifetime, doing mister poo poo in the sky. Still coming outIt's outYukyaaYu! Little one, super poo poo time will start!