Kim continued to sit on the single branch, pinning you against her asshole from the weight of her entire body, as she fumed with anger. You had dragged her along on this stupid trip, then decided to go on a hike, and then you had the gall to ask her to carry you. And now, as far as she was concerned, you were basically getting a free ride in one of the comfiest places possible. Kim's only respite from the agonizing march and the blaring heat had been when she swung a thigh over this branch, and as she let her weight drop, had felt your face bury itself into her sensitive asshole. For Kim, getting payback this way had been the highlight of the entire trip so far. After a minute, though, you had stopped screaming, ending the wonderful sensation Kim had been enjoying so much. Kim frowned, and bounced her ass up and down once to get your attention. She felt you struggling to rip your head free from her vicelike anus, which tickled but wasn't as enjoyable as when you were actively screaming and trying to yell up at her.
Kim sighed angrily, feeling sorry for herself now that you weren't entertaining her like before, while completely ignoring the obvious pain that she was putting you through for her own minor pleasure. The gigantic girl tried to think of a way to bring back your tickling screams: she had already bounced on you, which elicited nothing more than weak struggling on your behalf. Kim wondered if maybe you were out of air? Faye was stretching her legs next to a tree with her back turned, which meant that nobody was watching Kim as she started dragging her ass forward and backward across the knotted branch.
Down below, you were still struggling for breath. The weight of Kim's butt had crushed most of the air from your body, keeping you in a perpetual state of near collapse, as you attempted to draw more breath in through the wrinkles of Kim's anus. You had just come to terms with being literally pushed directly into this teenage girl's asshole by the entire weight of her body, when suddenly Kim started moving vigorously. Without warning, you felt the hard surface pushing through Kim's shorts begin to shift and slide. As Kim slid forwards on the branch, her pink asshole stretched away from your face while you were pulled backward along with Kim's wedgy in one direction. You took this time to gulp just enough air to cheer over your relative freedom, though your body was still sandwiched between Kim's large sweaty ass cheeks and your lower body was being mashed into Kim's asscrack as she scooted forward.
Before you could cheer too much, Kim suddenly began to slide backwards. The lazy girl's ripe butthole came crashing back down all of a sudden, it's center slamming exactly against your exposed face. You tried to scream in agony as your face was engulfed by Kim's tight pink hole, "NO WAIT WAIT WAAAI-MMPH!" as she continued to drag her ass backwards, but were cut off as soon as your face had been plugged into Kim's ass once more. Kim shuddered with satisfaction as she felt your tiny screams reverberating inside of her sphincter, tickling her euphorically. She made sure to push down against the branch extra hard, cramming your poor face into her impossibly tight hole more and more, while evoking more tickling screams from you. Kim mumbled gruffly, "Yeah, how do YOU like it, Tim? Making me come on this dumb walk, when I could be relaxing at camp..."
Just as Kim was getting really into it, Faye came over and shouted, "Alright! Break's over, lazybones, let's keep going. We're almost halfway there!" Kim groaned at the thought of having to hike so much further, before Faye kicked the branch just as Kim was getting off, causing it to jitter up and down. The branch slammed into the underside of Kim's asscrack repeatedly as it shook to a stop, each oscillation slamming against your back, hammering your head into Kim's puckered asshole as she simply stood there, letting you become imbedded into her ass. Normally Kim would have stepped off the branch right away, but this time she let it bash you into her jiggling ass over and over. Kim bit her lip as she felt you attempting to deafen the blows at her backside, which caused her ass cheeks to quiver and bounced against you. It finally bounced to a stop, before she swung her leg over the branch and followed Faye along the trail.
From within your jiggling prison in the crevice of Kim's ass, you can hear Faye call back, "Hey, there are two paths up ahead that lead to the same spot on the mountain. One's a super steep but short uphill climb where I might need to carry your lazy ass, and the other is a longer, windier path that goes along a nice stream. We could maybe even skinny dip to cool off if you wanted!"
Does Kim feel like you've been punished enough yet?
A. Maybe, so she forgets about you and suggests she and Faye take the path by the stream
B. Not even close. She decides to take the grueling steep path, just to grind you inside her ass some more. Plus, Kim figures if she falls, you'll be her little butt cushion!