A few liters of soda and a couple packs of mentos really go a long way to give a little test to see just how much that little tummy can take! By the looks of it though, he could probably handle a couple more liters and another pack of those mints!
(A little Kemonosortastyle Ruby that's supposed to be a secret exclusive for my Pixiv, buuuuuut since it's been a while I'll post it here too heheh~)