Though i would have much more preferred 2 dicks 1 hole, it's certainly creative to change -yourself- instead. Definitely the road less commonly chosen when a choice is even an option. It's not often you come across consensual human/dragon buttsecks.
Leave it to Inochi Wazuka to pull a Corruption of Champions. I always get so turned off my the way he (?) colors the covers of his books that I forget how much I like the interiors.