Currently being worked on by https://www.furaffinity.net/user/magayser/
It would appear that Arcturus has found himself being subjected to a matter of trust with another dragon. How could the dragon be sure that the previous dragon hunter was being honest of being a paladin of bahamut? By subjecting the hunter to what would surely be embarrassing for a dragon hunter, to be risen and lowered like a plaything, until being ultimately being knotted.
Unfortunately for Arcturus, the dragon would not be satisfied, needing many more tests.