I open my eyes. Where am I? My eyesight is blurred. I rub my eyes with my paws. There are lots of loud noises, but that might be from my small size. There's a strong smell of feet. You know, I've always liked the smell. But why am I smelling it?
I should probably get things straight—I'm a mouse. My name is Pluffled, and I'm a disgrace to my family. My parents each being over 5 inches tall, I grew to a little over 1 inch tall. I'm teased a lot in my pack, everyone is bigger than me by an inch or more. Never less than an inch. I get pinned down on the ground and forced to do what the mice want me to do.
But that's not all.
My tail isn't an ordinary mouse tail. It's actually…it's over 4 inches long. It's always clean, as if it stayed clean with magic, and it feels warm sometimes on the underside of it. Every time I move, and it drags, or if someone touches it, I get this feeling of joyful pressure building up in it and a burst of happy embarrassment which feels so addicting. Sometimes I stay up just to run my paws over it, to swish it repeatedly on the floor, and it feels indescribably good.
Abusive mice in my pack have used it as a leash for me, or they've hung me from it for hours. But the slow stretching of my tail during those hours feels amazing. I've told my best friend about how it feels and I've even paid money for him to hook me up to a stretching machine he has at his house. It's $40 an hour. I've paid over $550 in one day. That's over 14 hours of heaven. Once my tail calls to me, I'm drunk with the feeling. And even though I was born with a 4 inch long tail, I've extended it to 5, 6 inches. Someday I hope to reach 10. Maybe one day I'll have a tail longer than the tallest mouse in the pack. Longer than 13 inches tall.
But now that you know me, let's go back.
I take my paws away from my eyes and what's in front of me takes my breath away. It's Pikachu. He's sitting right in front of me and he's looking at me. He's enormoussss! He's ten times bigger than me. At least. And I happen to be sitting right between his giant feet. They don't look dirty but their smell is overpowering. They tower above me.
"Pika!" Greetings, tiny one.
I lift my head up and look at his eyes.
"Pikachu!" I need my feet cleaned.
"Squeak!" What do I get from it?
I project my tiny voice. 
"Pika Pi!" Nothing. I'll shrink you if you don't agree.
I get that feeling of happy embarrassment. I would like to be shrunk. It's cute. I'd get to be cuter.
"Squeak squee?"  Shrink me anyway. But I want to bargain.
Pikachu develops a puzzled expression. Someone who wants to shrink?
"Pika." What is it?
I inhale, and then sign my life away before I lose the nerve.
"Squeak!" Will you also make my tail longer?
Pikachu looks amused and shifts his feet. They waft their intoxicating smell into my tiny snout. 
"Pika Pikachu!" It'll grow as long as you clean my feet. I'll have to magic it into you first.
Pikachu reaches for me and picks me up with one paw. He lifts me up to his snout and he presses me against it. It's cold and a bit wet and I unintentionally squirm a little but he presses me into it and exhales through it. I feel electricity seep into my furry body. I glance at my tail, and it's glowing brightly. Then he moves me back into the ground and his feet sit there, patient waiting for me.
I run to his left foot and smash myself into it. I rub my entire body as hard as I can into the giant yellow foot, and I only cover a sixth of it. When I pull away, I feel a pressure in my tail. I glance behind my shoulder and see it grow. Not only does it grow longer, but it gets thicker too. I watch in awe as it continues growing, pulsing brighter during the climax of the growth. It feels so good, and so embarrassingly cute, knowing this is permanent. But then it stops growing. I get out of my head and pull my attention back to the foot looming in front of me. I jump into it again, rubbing my body as hard as I can in the space next to where I was rubbing before. And this time, not only do I feel my tail growing longer, but I feel a lovely tingling sensation as the foot gets bigger. I shrunk! I uwu at the feeling. It felt really good. I rub my tiny snout into Pikachu's foot, overwhelmed by the intoxicating smell that's driving me to keep going. I roll to the next space and dig my furry body into it. What used to be 2 times bigger than me, is now 4 times bigger than me. I keep rubbing, loving the feeling of my tail naturally getting bigger and the feeling of shrinking. I roll over so I'm on my belly, and I stick out my tongue, and I lick it. I shrink as I lick the foot, faster than I was shrinking before, as my tongue scoops up the overwhelming taste. I keep licking. My tail grows bigger. It's now over 15 inches long. I begin to climb the massive foot while I keep my tongue out, licking. I shrink very quickly when I'm doing that. I feel my tail touch the carpet, it's so long. I finally reach the top of the foot, and I find that Pikachu's toes are bigger than me. I uwu again, accidentally drooling on Pikachu's foot. I belly flop to lick up the saliva as I shrink more. I feel my tail grow as I shrink into the puddles. When I'm finally done, I look up again, and the toes are so big, I could live in them. I dive to the bottom of his right toe and I dangle my tongue out. I press my tongue against the surface and I begin climbing again. I shrink faster. I feel my tail getting bigger as I slide it along the enormous foot. I lick the toe with all of my strength, letting myself shrink smaller, unable to stop.
I barely notice through the haze of my smelly heaven that Pikachu picked my tail up with his paws. He plunged my tail into his mouth, as I imagined it, as a thank you gift for cleaning his feet. And then he started to suck it. And it felt so good, and I shrunk faster, and I couldn't help but uwu and lick more. I dragged my tongue across his toe up and down until I was too small. And then I dragged my tongue across his foot as my mouth drooled. I found myself inhaling air with a more intense scent as my tail got longer. Then I glanced up. Giant flecks of stuff that has accumulated in between Pikachu's toes sat there waiting for me. I threw myself into the amazing smelly meal and began to eat. I grew fuller and fuller but I just kept shrinking and I had to finish. I did finish, but I felt really full.
Pikachu kept sucking my tail. It was at least 30 inches long by now, and I was probably an eight of an inch tall. And I didn't want it to stop. I kept licking and eating, the smelly gunk tasting spicy in my mouth. I watched the toes tower higher and higher above me as I drooled all over his feet. I submerged my snout in the pool of saliva a moment later, still trying to lick the amaxing yellow foot as passionately as possible. I shrunk and shrunk, as he sucked my tail and made it grow bigger.
Pikachu never stopped sucking my tail. I shrunk until I was smaller than anything in the entire world. I'm still shrinking to this day. And do I regret it?
Not at all.