Reddit reviews The Kissing Hand

He looks like he came straight out of that children’s book “The Kissing Hand”

The Kissing Hand, maybe? It's very tangentially related to what you described, but worth a shot.

To add to that, there's a book I like called The Kissing Hand that helps with separation anxiety. It's about a mama raccoon putting a kiss in her baby's hand before school when he's scared. And she tells him that anytime he's lonely or scared, he can just put his hand on his cheek and get a kiss from mom and know that she loves him.

That could be a helpful tradition to start every morning before drop off.