I have Tyler here to toss at ya. (I co-own her with Poet)
She loves playing tricks on people, so maybe she could trick Ery into thinkin that she's a butterfly who has lost her wings. And they can run around trying to find them. (This would be Foal RP)
Could end on either a "you're mean" note or a "ha-ha that was funny" note when Tyler reveals she's not a butterfly. Whichever you think would do him best/however the RP turns out. x3