Irene's lips twist in a knowing smirk- I know precisely what you're doing -which suggests she'd like to grin but is holding it back. It's much more effective than an actual grin, somehow. It's also a lot less wholesome.

"'Researching'. What a term to use in a sex club." Another casual remark designed to make it clear that Irene knows what she's doing, and might just be the only one. "So. Curious. My favourite type of guest, but also the ones most likely to back out and never return." A wolfish smile. "Not that I expect that of you."

She doesn't; if she'd expected Odessa to startle and run, she wouldn't have carried on the conversation. She's not interested in people who aren't interested in her.