Pinkie is a blank flank.

^This

>Be a human in Equestria.  
>Like much others. Yeah, there’s a lot of humans living in Equestria, but this is your stroy.  
>You are Anon, an unique human with an unique name.  
>Ok, let’s go to the drill.  
>You live in SugarCube Corner paying a rent to the Cakes, a middle-aged marriage of two earth ponies and their two foals, Pound Cake and Pumpkin Cake.  
>They are a pegasus and an unicorn, born from two earth-ponies…  
>Is not like you’re saying that the wife cheated on her husband, not very loud.  
>Carrot Cake, the husband, a tall yellow earth pony with an orange mane and a squarish chin, tried to explain you how pony genetic worked but he didn’t even look very sure.  
>Cup Cake, the wife, was a chubby blue earth pony with a pink mane that resembles a cupcake. Even at her age, she got something that makes you, even if you don’t want to admit, desire to make her another pair of foals and another and another if you could. So the idea of her having some fun with others stallions seems quite likely.  
>There was another member of the family, she wasn’t a blood relative but that didn’t matter.  
>She was Pinkie Pie.  
>The pinkiest, bubbliest, happiest, dancingiest and everythingiest pony you could have ever imagine. Yeah, you learned some new words from her.  
>At first you kinda despised her. She was so talkative you couldn’t even hear your own voice. She was always behind you making you questions like “How are you?”, “What’s your favourite flavor? or “Does it rain chocolate milk in your world?”.  
>She kept pestering you until nighttime, when you realized that you should have to sleep in the same room as her.  
>That was going to be a long night, so you decided to go early to sleep with the hope of not having to hear her chitchat.  
>You didn’t stand a chance.  
>First, your bed was tinier than you would find comfortable. Pony beds tend to be wider but shorter, because they are quadrupedal being, not like humans. Understandable.  
>Second, you dinned cakes & pastries. Is not like you’re a glutton but there was nothing left, if you don’t count the alphalfa, daisy sandwiches, clover steack, etc. Fitting meals for ponies, stomach cleaners for humans, so they let you some of the leftovers of the day so you don’t go to sleep with an empty stomach. I would not happen again.  
>Third, Pinkie Pie.  
>She kept talking, singing how friends we would become and bouncing on your bed and once in you.  
>Finally you exploded. You told her to shut up, that you didn’t need her to be around all the goddamed day and that you would appreciate if she didn’t pest you anymore.  
>Way to go, smartass. Now she was there, quiet, still, with watery eyes staring at you.  
>You apologize. You tell her that it was a tiring day and you didn’t get any sleep from the trip and you wanted to rest a bit. It works, she’s not crying now, but she is still very quiet.  
>But the goddamed bed was too small for you! If you didn’t apologize to Pinkie that moment, you would be tearing appart that bed.  
>The pink mare (or filly, you don’t understand exactly how their ages work) asks you if you wanted to swich beds.  
>It would have been an awesome idea if her bed wasn’t so small for you, like the others.  
>You tell her to not worry, tomorrow you will order a human sized bed. They are a bit expensive, but you still have some money left. Still you didn’t have a bed to sleep on.  
>Pinkie Pie started to ponder for a brief moment until she explaimed “IDEA!” and flew off.  
>She comes back with two 2 litter bottles of “Derpycola” and 3 packages of “Mintos”. Yeah, Mentos, but they name it as they want.  
>She explains you that if you don’t have a bed, she would make one.  
>Pinkie open the 3 candy packages and swallows them instantly. After that she opens the first bottle of “Derpycola” and plugs it on her mouth.  
>You can hear how she gulps down the two litters of cola non-stop until the bottle is empty. After finishing the first, she takes the other and does the same.  
>You can’t believe what are you seeing, but it’s not like you would stop it.  
>After finishing the last bottle, she sits on her rump showing her now distended belly. She actually looks pregnant of some pretty big quadruplets but you know it doesn’t end here.  
>She asks you to go to the other corner of the room. You obligue and do what she asked you with an equal mix of fear and excitement.  
>And then it happens: The mentos start to react with the four litters of cola, making her stomach to expand in at a terrifing rate.  
>Her belly starts to grow even more, making her to look more to a ball with a pony attached to it than a pony itself.  
>When she stops growing, her hooves are unable to touch the floor.  
>Her belly got bigger than five ponies together. In fact, if she told you she just swallowed five ponies, you would believe her.  
>She rolls and lies on her back making signals to you to come and climb on her.  
>You tell her that you’re not sure, but she just laughs and explains that you needed a bed, so she became the bed. You’re not going to argue with her, what is done is done.  
>You climb her with caution. You think she could explode in any time so you will not force it. She jiggles every time you poke her belly.  
>When you are on the top, you realize how comfy she is. And is big enough to hold a human.  
>She looks pleased to know you’re enjoing it. You both start to play after reassuring her safety. Actually you just bounced in her belly. And fell. Two times.  
>After playing a long time, you both decide to go to sleep.  
>You thank her for everything and tell her she is a good friend.  
>She replies that she’s happy to know you think she’s a good friend.  
>And then you both fall asleep.  
>The next day you find she regained her natural size, only god knows how.  
>You buy your new bed that day so you would never have any issues again.  
>Still Pinkie Pie keeps asking you if you would want to repeat the experience every time you have a bad day. So yeah, sometimes you do it again. It’s still fun and she seems to love it. And you love it too.  
>She’s a good friend.

My very own inflato-pinkie!
 
Lol @ uploader’s name

Beefcake! BEEFCAKE!!