[With a thought, Crowley cleans and repairs Gwenhwyfar's damaged and bloodied clothes, assuming she might be more comfortable that way.]

Sit in the center and pop the ring on whatever finger you'd like. It'll fit.

[That's the advantage of something with magic and expectation woven into it, there's no need to worry about sizing.]

I'm going to change, s'easier this way. Don't panic.

[Shifting is a simple process, he just melds into the shape of the serpent, dropping down to the floor. He's large enough to circle the room twice, outside the chalk, resting his head on his own body and watching Gwenhwyfar with an unblinking gaze.

He'll give her a second to adjust, before doing more.]