skirt in dare

The first one was with poop so we ask for another and it was:
Skirt Tucked In
This dare isn't easily mendable for guys. While wearing a skirt, tuck the hem of the skirt in your underwear, or under a backpack or something. This will expose your backside, while making it look like an accident. Make sure to keep going until someone points it out.
“Wow. I don’t know if I can do this.”
“I must admit it’s embarrassing but it won’t look intentional so people will be very forgiving. We should go to the mall and check it out. On a week day there shouldn’t too much people. We could always drive to the crappy one on west street. There’s not a lot of people and it’s far from here.”
“I guess we could always check it out. We should get dress and I need to dry my hair.”
“Ok.” I sneak a last peak at her nipple before going down stairs to put my clothes back on.
When I came back up she had put a pink summer dress that came just above her knees. It was light enough to make the story believable.
We got there and scout the place. The food market was pretty deserted and the bathroom was near. Claire decided to go for it and I went to buy something to eat.
I sat down and Claire got out. She hadn’t made it very far when an old lady called her. She turn back and I got to see the dress tuck in her underwear. Was kind of sexy. The old lady told her about her problem and Claire quickly fixed it. She came back to me red in the face and we left.
Was meek but still a step for her.