You're at your girlfriend's apartment and she asks you to help her with her laundry that's just finished drying. As you're helping her fold the clothes you can't help but notice several pairs of her panties. Although you've always had a thing for panties you at first try to act as though it's no big deal. But in a sudden inspiration to be funny you pick up a pair of her panties and hold them up to the front of your shorts. This gets a giggle out of her, so you think 'mission accomplished' as you both go back to folding her clothes.
You think that's the end of it until she holds up the same panties saying, "Well are you going to put these on for me?" You laugh again thinking she was joking but she said it again. You tell her it was a joke, but she said it looked like you really wanted to wear them. Although part of you still thought she was joking you continue to try to talk her out of it. You know she's really not kidding when she gives you her pouty face complete with puppy dog eyes. With that your resolve completely collapses and you agree to put on her panties.
Right there and then you strip off your clothes and pull up the lavender solid lace panties. The lace tickles your junk as you pull them into place, and it isn't long before you're sporting a full woody. She giggles as she looks at your hardon pressing against its lacy confines.
You're quite embarrassed standing there wearing nothing but a pair of lavender lace panties, but soon she's on you petting your junk and a make out session quickly ensues. She pushes you up against the washer and continues to stroke your hardon through the lacy panties.
The lace is tickling your junk just the right way under her stroking and it's not long before you've reached peak arousal. You almost melt back into the washer and hold still as she continues to tease your erection. She leans up and gives you a quick kiss on the lips and says to you, "It looks like someone likes wearing lacy undies." You feel yourself get warm from embarrassment as you feel her hand move from stroking your erection to tracing the waistband right over top of it. This almost drives you even more crazy as her finger is tracing mere millimeters above your now raging hardon.
Now all you can do is to keep completely still as she continues to tease you. You look down to see her fingers move from tracing the waistband of the panties to placing them on each side of your hardon and drawing them up to the top of the panties. This sensation was beyond incredible, and your cock gave a couple of involuntary twitches in response. She then moved her hand down and rubbed it over your balls causing the lace to tickle them and remind you how full they were at that point. You're experiencing absolute bliss and would be entirely content letting this continue for as long as she wants to tease you like this.