Geralt is about to take more things out of the toiletries bag-- half out of spite, at this point, for how dramatic Jaskier's being about it-- when he hears Jaskier slosh through the water as he wades towards him. The bard's hand around his wrist is nothing; he could ignore it if he wanted to, could just keep doing whatever he wanted because Jaskier is just human. He doesn't have a witcher's strength, and his hands are delicate. The pressure of those fingers around his wrist arrests him regardless.

Jaskier tries to catch his eyes, and when Geralt looks at him, his face is written with concern. Worried, even though there's nothing for him to be worried about. This is just a little sacrifice for what Jaskier wants from him. And the fact that this is for what Jaskier wants from him makes his question so confusing; of course it isn't for vanity or his brothers or Ciri. It's for Jaskier.

"Last night," he says. "You asked me to bite you. Did you forget already?"

It seems strange that he would, considering how adamant he was about being bitten when they were in bed together. Practically despondent when he refused, but that's why he promised him later-- he could do it once his teeth are filed down to a harmless length. Once his task is done, he'll be able to leave as many marks on him as he'd like, bite him up to his heart's content.