You found yourself inches away from her huge bubble butt, and upside down because of how she had her hand. "Well, I'm having a hard time concentrating back here, but yeah I see it." you joked. Juli giggled, which caused her ass to quiver for just a moment. Despite the blood rushing to your head, your erection was still throbbing. Juli continued, "Well, it feels like the cloth down there is all twisted and knotted, and it's making my butt itch. Unfortunately, I can't pull it out all the way without taking the whole thing off, and since it's such a pain to get in and out of, I'd rather not undress." Juli swung you back up in front of her face, making your head spin. "So, my little partner, do you think you can give me some assistance with that?"
You looked up at Juli's smiling face, "Are you sure you can't pull it out yourself? I mean, your ass is really, uh..." You tried to think of an excuse, as you didn't want to tell her she had a big ass (no matter how sexy it was, you knew she was sensitive about it) but you didn't want to get crushed between her buttocks either. "Won't it smell bad?" you asked.
"Don't worry about that. I shower every day, and the chlorine of these pools pretty much gets rid of any body odor." Juli noticed that you still looked a little hesitant, so she brought you close to her lips and whispered, "I'll make it worth your while..." and stuck her tongue out to lick your body from the waist down. You moaned as her tongue slid along your crotch, until she brought you back in front of her face. Juli smiled cutely as she waited for your response.
"You certainly have a way with words." you say. Juli beamed, "Oh Jim, you're the best!" and gives an excited little hop, bouncing her breasts beneath you. Juli swung you back around behind her, so you were positioned (upside down) an inch from the base of her butt crack. Each buttock curved smoothly out and away from you, an immense wall of soft flesh. You could see the two strips of red fabric of her bikini stretching from her shoulders down to her ass, before disappearing into her crack. Juli spoke over her shoulder, "Alright Jim, I only have one free hand so I won't be able to pull my butt cheeks apart. I'm going to push you in until you're next to my bikini, once you're in you'll have to figure out what's wrong with it and untangle it from there. I should be able to hear you decently, so just yell if you want me to push you in farther, raise you up or down, or pull you out."
"Okay that sounds good, but are you sure you'll be able to hea-" Juli only let you get as far as "sounds good" before she cut you off and said, "Good luck Jim!" You were suddenly headed straight for Juli's ass crack. Juli's back vanished as her massive butt cheeks blocked out everything above you. Just as you were about to reach her ass crack, Juli shifted her weight just slightly, turning her ass to one side by less than an inch. Unfortunately, at your size this meant that you weren't lined up with her crack any more, and before you could yell Juli pushed you face and crotch first into the underside of her ass cheek. Juli felt this, and said apologetically, "Oops, sorry Jim! I can't really see what I'm doing back there." as she slowly ground you across her cheek, towards her crack. Eventually you reach Juli's ass crack, when you suddenly stop. You could hear Juli high above you saying, "Oh wait, let me turn around so I can use the mirror." You begin to shout at her to stop, but Juli can't hear you as she begins to move, without pulling you out. It's only a few quick steps for her, but for you, stuck pressed against her ass crack, it's hell. One second a massive ass cheek slams into your side, then the other slams into your face, and then you're pinned between them both. Juli turns her ass to the locker mirror, and looks over her shoulder to see what she's doing. "There! Much better, eh Jim?" You can't respond, as her ass cheek is smothering you, but she assumes you're fine and continues anyway.
Now that she can see you, Juli gets you lined up properly so you aren't being mashed flat against one butt cheek, and begins pushing you further in. Juli's smooth skin brushes past either side of your body, and you actually begin to enjoy yourself a little bit. Juli was standing up straight, so her ass cheeks were relaxed, giving you nice squishy walls on either side of you. A tiny bit of light filtered through the passage Juli's finger made between her cheeks. After a couple seconds, you thought you saw the thong up ahead, so you yelled out, "Stop!" Juli didn't seem you through her ass, though, as you continued to slide closer and closer. As you neared, you thought you could see a darker patch behind the tiny piece of cloth, which you were sure was Juli's anus. "STOP!" you yelled again, now right next to the bikini. You outstretched your arms, bracing for impact. You placed each hand on either side of the cloth, and began to push away from Juli's ass, hoping she'd feel you. Juli's finger kept pushing you forward, completely uninhibited by your resistance. Your body was pushed past the side of her thong, until your cheek was resting against the skin right next to her anus. Juli suddenly gasped, "Jim! Are you there yet? I think I can feel you." Her voice was slightly distorted by all the butt flesh surrounding you, and you worried she wouldn't be able to hear you at all if you tried to talk to her.
You shouted, "Yes! Pull me back!" as loud as you could, before you were suddenly mashed up against Juli's anus. Your face was pressed into the squishy skin next to her sphincter, as your body from the chest down covered the anus itself. Juli pushed until her finger had you pinned against her skin, then stopped and waited. Your face was pushed against her smelly skin, and you noticed that it wasn't as "odor free" as Juli had promised. Your crotch was aching, as it was being crushed firmly against Juli's anus opening. After a few seconds without feeling you move, Juli asked, "Jim, you said to push you in, right?" and when she didn't hear you say anything, she grumbled, "Oh damnit... sorry Jim!" and pulled you back a bit.
You gasped for air as you separated from Juli's anus, and shouted, "HOLD ME STILL!" This time, Juli seemed to get the message, and said, "Ok." You surveyed the area in front of you. Juli's bikini had somehow managed to twirl around a bunch, until it was bunched up in the middle, just below you. You shouted, "Okay, lower me down!" It was only when Juli began to raise you up that you remembered you were upside down, so actually you were seeing everything in reverse. Juli's finger tip, and your head, popped out of the bottom of her butt crack, between her thighs. You could see Juli's smooth, thick thighs cascading far away from you. After appreciating the view, you yelled, "Sorry, I meant the other way. Bring me back whe-" Before you could finish your sentence, Juli chirped, "No problem!" and dragged you back between her butt cheeks. However, she apparently wasn't being too careful with her finger, and accidentally brought you a little far forward. Your face was suddenly met by the base of Juli's ass crack, as she dragged her finger up the center of her buttocks. You could feel her thong passing by your side as most of your body was rubbed across her anus. You felt the twisted part of Juli's bikini pass you by, when suddenly...