Remember, Koishi doesn't think, she doesn't have a mind, that way of response from Satori trigger an instinctual fear on Koishi.
Reacting to this kind of mood would be trouble.... On the other hand, I'd feel bad for her if I didn't react at all...Nee-heeeeWh-...what is it, Koishi?Siiiiiis!♡Guess what!
Guess what!♡You want to talk with your big sister?