No

"You know what?" You say, with a roguish smile. "I think I've changed my mind..."

"What?!" Keyleth seems relieved and confused at the same time.

"You don't seem enthusiastic about serving me, so I'm just going to go **** Vex's asshole until she begs me to stop." You explain.

"No! Please! I'll be enthusiastic!" She insists, thrashing in her chains. "Please, Master, I'm sorry! I'll do whatever you want! I'll be whoever you want me to be!"

Knowing that the gambit would work, you smile at your own ingenuity nontheless. Then you snap your fingers, and the chains turn so that Keyleth hangs upside down. Stepping forward, you disrobe and lay your sweaty balls and massive cock across her whimpering face.

"Give me a satisfactory blowjob and perhaps I'll consider using your miserable ass instead of hers." You command.

Keyleth trembles for a moment and then opens her mouth, having to crane her neck to lick the tip of your cock. You laugh as she flexes her whole body to perform this meager act of fellatio. Still, she continued this futile series of motions, **** to prove herself.

You wait until she is exhausted to stuff your cock in her mouth. You pound her face until her eyes are wet and her saliva drips from your cockhead. You don't cum. but that's alright. this was just foreplay for the main event, the tormenting of her ass.

You consider briefly whether to loosen her asshole before doing so.