She has now found your deepest secret. Talk to her, explain. you have nothing to lose and everything to gain if you stay calm.
I have not come across a genetic girl who does not like wearing sexy lingerie and panties. Imitation is the best form of flattery and make sure she is aware of that. She should have some empathy with that.
I took that tack with my ex wife. She actually agreed with the good feeling wearing sexy outfits but later went to ostrich mode, head in the sand , then as we drifted apart for other reasons , to describing it as my dirty secret.
Be prepared for that but tbh it depends on her personality and her ultimate feelings for you.
All the very best to you x
