[It happens suddenly enough that Hermione doesn't have time to react until after the courtesan has said her piece, and when she does react she does it with perhaps not the most subtle of decisions.

Instinct moves her feet to step up between the courtesan and Caitlyn, waving her hold off Caitlyn's wrist with the pure force of her bossiness. Instinct is also what spurs Hermione's Fake It till You Make It behaviour, the words out of her mouth in clipped tones:]

Thank you, she's taken and I'm not into sharing. Genuinely, all the best of luck with your...er, trade, but - uhm - elsewhere.

[And whereas she doesn't explicitly say fuck off, she does stand close enough to Caitlyn to possessively imply it. The courtesan scoffs in disappointment (good thing Hermione said she didn't want to share) and leaves them alone.

Give her one second, the stuff she just said is catching up to her.]

Right. [Oh Merlin, why did her voice crack? Is she blushing? She's probably blushing, but she's going to pull Caitlyn along into the den before either of the witnesses come back for seconds.] I'll stick by you for the - the story.