Well, those fingers prove to be enough when he changes the rhythm that way, and the new pressure makes Taako squirm, bucking forward as, after only a few more seconds of that, he's pushed over the edge, his cock pulsing beneath Byakuran's fingers as it's pushed up and against that tube; he comes at least partially into it, if not entirely.

And then he relaxes, hanging more loosely in his restraints, his eyelids fluttering and breathing harsh as he comes down; when he looks down at Byakuran, he can't help but halfway-stifle an embarrassed giggle at the sight of the man there in front of him, holding a tube up to his cock. It's so bizarrely clinical, such a contrast to what he just experienced.