How do I kiss Arion after I get his hooves fixed? It's crossed out.
You need to get the 2nd heart with him. To get it, you need to talk with Rose about Arion, and she'll suggest you give him a flower (she sells you one). After you give him the flower, come back in a day or two and Arion will give you another flower in return. Respond positively, and it'll unlock the 2nd heart.