Keep testing her

"Right, thanks!" You thank the goth chick, but feel like your real question hasn't been answered yet. You're not sure how to keep testing though, without making some kind of scene. "So... That's it? You like the looks and feel, but it doesn't do anything special for you...?"

"It's cool and all, but not quite enough to get me excited or anything, if that's what you're asking?" She replies with a completely honest look on her face. "Perhaps if your girlfriend was really into these, or not usually wearing leather at all, then you'd have a better reaction from her..."

"Ah, yeah..." You thoughtfully nod your head. "I'd really hoped that... No, wait... Actually, I wish that you liked it a whole lot more. Like, you'd get really turned on by wearing it."

"Well, I wish I could help you more..." She says with a cute smile and a shrugg, while reaching up to take the collar off again. But just then she stops in the middle of the movement, with a curious look on her face, as if suddenly coming to think of something.

"Umm... Actually..." She ponders, and you notice her cringing a bit while running her fingers across the spiky rivets. Her voice remains entirely upright, but there's also just a hint of excitement to it. "I... I just didn't notice at first... But it really is kinda sexy!"

"Really?" You wonder, getting your hopes up again that the collar might actually be working. "Are you sure...? I mean, I really wish you could help me out on this one and tell me all that you feel about it!"

"Yeah, sure!" She agrees, while still fingering the collar around her neck. "I feel... excited about it, but I'm not entirely sure why... I just like the feel of it, like no other necklace I've ever tried before. And it's making me real horny to boot!"

"But it's kinda weird too, you know..." She continues, before you've had the time to cheer at the successful test. "It's almost like it compells me somehow to feel like this, and say all these things... I'd never been this honest with some complete stranger on my own..."

"Uh, yeah..." You start, wondering how to solve this without her making a scene or something. Already there are a few people looking at you weirdly, like they've overheard some part of your conversation, or simply noticed how this chick has become increasingly restless like she's got hot coals stuffed into her underwear... "I wish you'd just ignore that last bit, about feeling like the collar makes you do things... And I wish that you don't find it weird at all that I'm making these wishes!"

"Okay!" She shruggs and smiles, but doesn't stop squirming as you've said nothing new about how the collar already affects her...