Per the Encyclopedia Eorzea, dragons don’t have sex organs in the same way other creatures do. They do all lay eggs, though.

Ysayle’s excited to give a dragon pleasure, and she has some ideas about how. Ideas involving her tongue and what’s under their tail.

Any dragon is fine! Hraesvelgr, Vidofnir, Midgardsormr, a heretic turned draconic through blood, whatever filler likes.