>>23469201See it would be different if he was the servant of Waver, but fugged Sola-Ui. That would make him a slut and disloyal, but if he fucked Kayneth and Sola as Kayneth's (and I guess by extension Sola's?) servant, then he wouldn't be a slut as he is attached to his master(s).
It's harder for a man to be a slut than it is a woman.