First off, I'd ask yourself if you really think he'd want to do your mom. If the answer is no, then focus on the main issue... he has this panty fetish. If you can get past your introduction into this fetish (your mom's undies), maybe try to embrace it so that he feels like you accept this part of him. See if he'd want to go undy shopping or something with you. Maybe that'll help you feel more settled, and him more comfortable.

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