[Chapter translated to English by Random Anon, originally written in Spanish]
In spite of how incredibly tiny you were right now, Bertha managed to spot you on her humongous left buttcheek.
"Oh, there you are! What do you think of living on planet Bertha, huh?" She teased with a slight smirk "I think we need to put you somewhere safer" She then her titanic finger across her skin's surface and scooped you up with her fingernail "Where do you think is a safe spot to keep you, hmm?" She asked but the smugness in her tone was made it more than clear that she wasn't expecting an actual answer from you.
You didn't think Bertha would've been able to see you at your current size, specially on her massive buttcheek. You were still breathing heavily, desperately getting fresh air in to rid your lungs from the noxious stench from her fart earlier, which left you unable to speak even if you tried.
In the meantime, she was actually thinking about where to put you that she could get away with keeping you for herself and not completely lose track of you, defeating the very purpose of that. At that time, a massive 30 second-long fart erupted from her huge ass, loudly echoing around the whole bathroom. The sudden and explosive release caught her off-guard but it helped her to decide on where to keep you.
"I think I just got the perfect place for you" She said with her usual, dangerous-looking smirk while picking out her deeply wedged thong out of the blubbery abyss she called a buttcrack, where it had been relentlessly devoured by her immense cheeks.
"I've got a feeling you'll enjoy spending the rest of your life down there, right next to these huge buns. What's not to love?" She teased, using her free hand to grab a handful of one of those planet-sized glutes and squeezing to show off just how incredibly squishy and doughy it was, her fingers sinking deeply into the blubbery mass. With no further warning beyond that, she carelessly dropped you into that cosmic-sized abyss.
As you fell, you'd been so overwhelmed by all that happened that your first impulse was to be in denial, specially after having heard her saying that she'd put you in her ass again, only that it was so much bigger now than when you first fell into it.
Any notions of this being just some horrible nightmare shattered to pieces when her finger brought you over her deep, dark crack. You fell like you were falling into a bottomless abyss, finding yourself in a warm, steamy atmosphere that reeked of staleness, sweat and methane but then you smacked into a fleshy ring that immediately reacted to your little touch, twitching frantically.
"Now that you're all nice and settled we should get back to our spot" Bertha said and began walking back to where Snickers was while thinking up a good excuse to tell her about your unknown whereabouts, without actually letting her know that you were imprisoned in her huge ass of course...