You relent and leave the store together.

You move and undo the top binding Katie, by pulling it fully off her body. She stands up, topless and flushed red making no move to cover herself. Just then some voices in the next aisle make you both jump. It sounds like someone might find you any moment.

Katie quickly pulls her leggings over her wet pussy, now without a thong. She snatches her top back from you and gets it fixed back over her bare breasts. She looks way more exposed than before, you can see her hard nipples through the top and her commando look is noticeable if someone looks closely.

Just as she finishes dressing, a couple of guys walk around the corner looking for some items. You step over to Katie and act like you are together.

"Lets get going" you say casually. She glares at you, but walks with you towards the exit without further complaint.

She walks out just ahead of you, and once outside in the sunshine you can see how revealing her leggings really are. The sun has made her whole ass visible, the leggings are basically transparent.

As you head away from the store, she turns to face you and block your way. You can see her bare pussy clearly under the transparent leggings.

"What the hell was that?" she demands.

"Well, you seemed to enjoy it. The flashing, the exposure, the risk. You going to deny it?"

She pauses for a moment. "Well....no, but you still had no right to strip me like that"

"You can always give permission for next time" you say half joking and winking at her.

To your surprise she giggles. "I'm sure we can work something out. If you promise to keep my secret, we could have fun together again. You can help me flash people."

You find a big grin appearing on your face. The summer had just got a lot more interesting.