Painting wasn't just his outlet, it was his form of living. It was a way to express himself, a way for him to vent.
When it came to painting, he needed to have a particular object or person he found interest in. Before it was Bianca, his ex, and Wednesday, the girl he had been interested in. Lately, it had been you.
Xavier never really met a selkie, at least not in person anyway. According to Bianca, they were downgraded versions of Sirens. But to him, you were.. ethereal. You were kind to everyone, always helping them in difficult situations.
"Hey um, do you mind helping me out with this?" Xavier asked you quietly during a botany class. God, he was so confident and outspoken with his friends, and yet when it came to you, he was weak. "I've tried everything to get this plant to grow, but I guess it's kinda stubborn."