[meford4u]

Had the same type of experience in University. Except I had a little more class and she left them at my place. I didn't tell her about it, and she never asked.
She really wasn't worthy of a second "date". but a second jump in the sack would be just fine with me.
I knew that I would bump into her at a party about 2 weeks later and we still talked and conversed with one another, so it wasn't awkward and strange.
But I did return her panties. Cleaned and polished.
I pulled her aside at the party, and told her to come with me as I had a present for her.
I pulled her into the bathroom, dropped my drawers, and she burst out laughing. I was wearing them. That's when the second time happened. Best thing I ever did.

Try it. She'll love it.