The hike and some exhibitionism

Your group starts straight from the hotel, and follow a path which quickly leads into the woods, and from there only upwards and upwards. Its getting warmer, and quickly you´re down to only wearing your t-shirt.
The girls strip off some of their clothes as well. Marla wears a red belly-free top, which clearly reveals that she doesnt wear a bra for everyone to see.
After around two and a half hours, you reach the top of the mountain. The view is stunning. You can see the landscape, the hotel, the town..the sun isnt setting yet, but will be on your way back.
Hailey and Emily decide to refill your water bottles by a small hut a bit further, leaving Marla, Lydia, John and you.
Marla steps up on a stone, her back to you, facing the valley.
Then she does the last thing you expected-she takes off her top.
You´re clearly as perplexed as anyone as Marla flashes the whole valley before you. All of you stare at her. "What?" she says, turning her head to look at you.
"You´re...naked." John states.
"And? I´m not wearing anything in locker rooms either, so I have no reason to mind Lydia seeing. And for you boys-John is locked in that cage anyway and Ethan has seen me often before havent you. Besides, its really hot."
She takes one look at the valley, then she turns around.
You just watch as she sits down, and driks the rest of her water, completely unbothered.