Late at night, you, the human lay upon a soft, white cloudy mattress. Literally, it was made out of clouds, the same clouds you would see in the sky. However, this is an alien world so things worked differently here. The very building you resided in was made of clouds, that was so dense it might as well be a pillow. The strange, alien cloudy material was soft and fluffy to the touch. The building was well insulated. The clouds were substantially thick to the point they blocked out the cold winter air from outside.
Your white, thick, fluffy blanket itself was made out of this so-called ‘cloud’. Not only that but you were also provided extra warmth by being snuggled up to a massive, cyan winged horse with a horn atop her head. She was also thick… really… really thick. In fact, she is probably the thickest horse in all the world.
Affectionately, she was known as a pony, she was of a particular breed known as an alicorn. The height difference between the two of you was quite substantial. She was literally about 10 feet tall when standing up.
Your head rested upon the midsection of her back, buried in the softness of her folded, fluffy wings. It felt absolutely divine to rest your head there, it was like that of the softest pillow you could imagine. The softness of her warm furry body against your bare skin was also quite incredible. Wonderful soothing heat radiated off her body, she provided you with all the warmth you needed on this cold winter night.
Her glowing, rainbow tail was wrapped around your body, which acted as a secondary blanket to keep you warm. The light it gave off was very faint. It was in night mode. Her tail felt incredibly soft to the touch against your bare skin. When combined with the softness of her furry body also against your bare skin, you could not help but have an erection.
Down below your large, magically enhanced cock rested against her right, thick and bubbly cheek. Your hands rested upon her plump asscheeks, they dug deep into the plush softness of her ass. Your hands barely reached her cutie marks on either side of her humongous buttcheeks.
Deep underneath the thick layer of her marshmallowy soft fat upon her rear, your hands met her ironclad muscles. This mare was huge. She was basically a draught horse, but on steroids. Her monstrously large asscheeks were like that of beach balls.
Your marefriend was the one and only Rainbow Dash. The fastest pony of all of Equestria… no, all of the planet Equus. She was once just a pegasus. But after some magical shenanigans with Twilight, she, alongside her other best friends ascended into godhood and became an alicorn just like her. You've been with her for many decades. You haven't aged a day. Alicorns can make their lovers immortal so it was all good.
However, there was a consequence to becoming an alicorn. Over the years she was getting just a little bit taller, not to mention thicker. She also had increased food cravings, which was not helping.
Rainbow Dash was once only about four feet tall. Now she's easily about ten feet tall or so. She's a big mare. She somehow became even larger than Princess Celestia. Your marefriend became upset as the weight kept piling on overtime. You did your best to reassure her and told her that you still love her. One of the few ways to keep her calm and relaxed was to spoon her. She loved being spooned.
You did miss Rainbow Dash being small and cute. But you weren't going to leave your big mama horse love. Gone was the brash, little sporty mare you fell in love with all those years ago. She has become very clingy and anxious. She is worried that you may leave her for a smaller, thinner mare. You needed to reassure her quite often that you would never leave her. The poor mare hated that she was now so huge, heavy, and thick.
You do miss the little Rainbow Dash that you met all those years ago. But you would never leave this mare. Ever. You would consider yourself a heartless bastard if you left her now just because she became absolutely massive.
To be honest, you loved her butt. Her big fat butt. The sight of seeing your hands sinking into the plush bubbly softness of her buttcheeks was wonderful. The applied pressure with your hands created an asteroid-like crater upon her lovely cheeks. When you would move your hands to a different part of her rump you would see the depression fade away and her cheeks would return into a perfectly smooth shape in that area. While Rainbow Dash's ass was absolutely enormous, it still remained a perfectly smooth shape, as if it was crafted by a professional Greek sculptor. There wasn't a hint of sag in the least. Her ass seemingly defied gravity with its magnificence.
It was perfectly round and smooth. And you got to watch it slowly get bigger and bigger over the years. You still fondly remember Rainbow Dash having a much smaller ass. Yet, you have grown to love this big monster truck of an ass she now has. And you could worship that ass forever, literally forever, for you were immortal being her lover.
For quite some time, the two of you merely lay there, saying absolutely nothing. You were quite content to do so. Until, eventually, you heard your mare friend speaking in a worried tone. “Anon, do you still love me? Am I still the cool little pegasus you met all those years ago?”
“Dashie, I love you with all my heart. Of course, you're still cool. You're the coolest pony I know.”
“Do you really mean it? Look how fat I am now? How could you love a big fat mare like me?”
“Rainbow, while I miss you being much smaller. You're still the mare I met all those years ago. You just worried these days that I would leave you just because you gained a little weight.”
She scoffed in annoyance. “A little? I'm practically an elephant, dude. A big fat elephant that struggles to fit through doorways with her enormous ass. And every time I walk around, I hear my buttcheeks clapping together as they jiggle about wildly." she sighed deeply. "I feel so fat and ugly.”
“You are not ugly Rainbow! You are my big sexy mare. You are absolutely gorgeous. I get to snuggle up to your lovely backside every night. And every morning I wake up I am greeted by the sight of your big, wonderful ass.”
“I don’t understand. You like me being fat?"
“You're not fat Rainbow!” you exclaimed, before speaking calmly again.”Listen to me, my love, you are just really tall. Therefore, it just gives the illusion that you have a massive backside relative to your size. You still work out really well. Your stomach is flat. Your body is well-toned and sleek. It's just that you have grown huge, so it gives you the illusion that you are fat.”
The mare shifted over to face you. You were met with her large rosy red eyes glowing in the dark as they stared down at you through the darkness of the room. From there, the mare leaned her head down and kissed you on the lips, and much of your face with her large equine mouth. As she kissed your face, you, with loving tenderness stroked her silky, ethereal soft mane, which blew in an unseen wind. You felt a strange tingling sensation course through your hand roaming through her hair. Her rainbow hair partially illuminated the darkness, helping you see Rainbow Dash’s beautiful face a bit easier.
Kissing this big horsey was strange, but you didn't care. You loved your big mama horse, and a small part of you wanted to see if she would get even bigger. Her big fat butt had really grown on you over the years. She is perhaps not the fastest pony in the world anymore with this monster truck of an ass she has to carry around, but you would make sure that big fat butt is well worshipped forever.
