Geralt mistakes Jaskier for a, ahem, lady of the night, and Jaskier goes with it. As you do. "I don't require a whore." Funny thing is, Jaskier wasn't about to offer. He means to convey words to that effect to settle the matter and dispel any potential future misunderstandings, but finds himself saying instead, "Why not?"

The bard is an omega, young and pretty but poorly received by the tavern crowd. He smells like a stray, is barely older than a pup, and isn’t very good at his work. Geralt isn't interested in him besides that, but for some unfathomable reason the other is interested in him. He lets the bard follow him mostly just because getting rid of him would be more annoying, and maybe because he pities him a bit. But it's not going to be that interesting a job, he's already sure. There's no harm in letting a human hang around. Of course, then they get kidnapped by vengeful elves. So . . . fuck.

The wedding’s going to be tonight, presumably so no one involved has time to get cold feet, which gives Geralt just enough time to clean up and get the dirt off his armor and overthink every tiny little detail of this arrangement.