Responses

It's not bestiality if the creature possess higher intelligence and the ability to consent. You also forget that Tsukumo was a human before he started changin' into a dragon six months prior to meetin' Murasaki.
Bestiality implies that it's a literal animal with no ability to consent or lacks higher intelligence. If Tsukumo was just a beast without the ability to speak or think for himself then that would be a totally different case but he's not so he lacks the key component for somethin' to be categorized as "bestiality."
GREAT so now I'm attracted to a fckn dragon...and I'm also crying over a technically beastiality relationship between a dragon and a human. How is this so wholesome pls