Big cotton panties with a twist

The panties arrived in a package which was waiting for you when you got home from work on Friday. It had no return address or any indication who it was from. You couldn't remember having any order arriving today but it clearly has your name on it, so you decide to open the small cardboard box. You are perplexed when you find a simple pair of cotton white panties, of apparently high quality based on the feel and look of them, but they were otherwise unremarkable. What was strange was the extravagant and artful packaging these basic undergarments were given. In addition to fancy packaging paper, the panties game nestled on a cushion and placed in a beautiful velvet lined box. The box had a strange message stitched into it, reading "A magic experience awaits..."

You don't know how to interpret this as anything other than a weird joke one of your friends is playing on you. Not knowing what else to do, you decide to go into your bathroom and try them on before getting ready for your Friday evening.