They jog his memory! He remembers people, and what his mother looks like, and that one ex-boyfriend who he still pines over but has never gotten the courage to call again since they broke up's phone number!

Also his notebooks, which he quickly devours and memorises lots of things.

Not that he needs to.

He beams at Addy as his skin gets less sparkly and becomes red, then he grows a tail and a pair of horns, and it's all pretty smooth and much faster than he could've done while human. "This is so much easier! Look!" He cups his hands and shakes them a bit, and they fill with bone powder. "But I bet you knew that, I bet you tested all these things when you were on your own already!" he accuses playfully.