His hand tenses under Steven's for just a second as he notices those claws. Oh, oh this is a whole thing, isn't it. Maybe... maybe it's like the cat thing, but really really slowly this time. And also green? They may need to do a thorough body inspection once Steven's feeling up to it. One... one thing at a time, though.

"W...ell... I could be wrong, but..."

(But he can't imagine what else it could be)

"It looks sorta like you're growing a, uh, tail."