I would have to say Cairn! Just because he has centuries of practice, a ruthless enough personality, and the magical skills as a failsafe should he push things a -little- too far. I imagine Ruth would be in second place, she can get a bit caught up in the moment and doesn't always realise her own strength. Roth in 3rd after her, but is a lot more careful and there's plenty of aftercare to be had once the squeezing's over.

I like to think that all of them go tight on whoever is in their coils when they cum. It's a natural impulse and it's hard to hold back when all 30+ feet of their bodies is experiencing an orgasm.