Quozl the couatl was polite. He did try to get the gryphon to leave. But he's bound to guard that tower and if an intruder won't leave, well, it's not the first arrogant young gryphon to lie stretched out in a cool feathered serpent belly and it likely won't be the last.
It's probably just a coincidence that the ones that end up in a couatl's belly, or in a foxtaur's or brass dragon's or giant badger's, are the ones Goldfeather has the most trouble keeping in line.
From this story: https://www.furaffinity.net/view/41537581/