We haven't been told the specifics of how it's meant to happen, but if you're curious, you can always ask the Regent themself.

[ the more he talks, the more he knows it's difficult to sound convincing, but he's only working with the knowledge he does have. one way or another, everyone will succumb to the kenoma so even if cassius refuses it now, it will sink its claws in sooner rather than later. ]</small. Regardless, it's best not to rush the process. If it's going to take time, then let it take time. I'll be at your beck and call should you need anything to make this whole experience less... unnerving.