It's probably less literally fucking a dragon and more some kind of magic... Ritual thing? But Zellias doesn't care enough to research it. Dragon bangin' is as good an explanation as any.

"...that sounds like exactly what I'd expect from fairies", apparently he has expedience. Fairies, all of them are absolute madmen.

"So you're some kinda construct made of random bullshit? Y'don't look like any warforged I've ever seen before. Too fleshy."