I Said No Human Sacrifices, Dammit!

A stereotypical result of a CYOA story is the protagonist turning themselves into a dragon.Well...Our protagonist did exactly that. But no, he didn't make himself a dragon and then spend all his time as a human anyway, our protagonist is a bona fide giant flying lizard with a breath weapon and incredible magical powers, reincarnated into a world with primitive, tribal humans.The protagonist really didn't know what he was getting himself into...