It sounds like you're in an awkward position here - your partner may be disappointed that their idea wasn't appreciated or taken seriously, while at the same time not wanting to hurt your feelings by being too critical of it. The best thing to do is for both partners to come together and try to understand each other better. 

If you feel uncomfortable with the idea of a Harry Potter bondage scenario, it's important to communicate your concerns to your partner in a calm and respectful manner. 
You can start with open-ended questions like, "What were you thinking when you made that suggestion?" This way they can explain the thought process behind their idea, while also giving them the opportunity to understand what you think about the idea. 
It's possible that there may be other scenarios or fantasies that you both can explore together that would be more comfortable for you.

In any case, it's important to approach the situation with empathy and understanding, and to avoid attacking or belittling your partner's preferences or desires. Instead, try to work together to find a mutually enjoyable and consensual scenario that satisfies both of your needs.
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