[Yokuutsu]

It's just Vivi's natural reaction to things. When he's embarrassed, he just wants to go and hide...kind of how when domesticated animals know they've done something wrong, they go and hide and won't come out. He makes a little questioning noise, his ears twitching, as he hears Riyo sigh. He didn't do anything since...that...that he can think of at least. Vivi's lack of control is only from the lack from him getting excited like that. Can't learn to control something that you've never had happen before. Vivi, instead of going to sleep, passes out while reading instead. And Riyo happens to be the pillow of choice for this.