Today, on a hot summer’s day, you, the human, were helping out the eccentric lavender unicorn known as Twilight Sparkle with her friendship studies. Both you and Twilight were situated in Ponyville Park. You could hear the sounds of distant foals laughing, and you could hear the chirping of birds. A gentle breeze was in the air, which helped you a little to cool off on this hot summer's day.
You were sitting down on a wooden bench, next to a paved path (just to your left) through the park. The mare was straddled over you. Her head rested on your right shoulder, resulting in her silky soft mane in your face, along with her eyes closed. Her two, front forelegs were partially wrapped around your upper torso; her soft, spongy feeling hooves touching off your sides. As for her back hind legs, they were pressed against your sides, upon your lower torso.
And… most importantly of all, her heavy, plump backside rested directly on your crotch, which caused an unavoidable erection. Your hands rested on Twilight’s lovely asscheeks, and were shrunken deep into their plush, bubbly softness; before meeting her strong muscles deep beneath the thick layers of squishy soft fat. What's more, you believed this unicorn had the potential to become a princess since she was Princess Celestia's personal student. So, you may have to deal with her having an even bigger ass in the future. Since Princess Celestia’s fat ass seemed to be clear foreshadowing of her future as a princess. But instead of cakes, Twilight will inhale burgers to fatten up her massive royal backside.
Your cock in your light blue shorts pressed against her warm, soft, heavy rump resting on it. As for your other clothes, you were wearing a simple white t-shirt, and brown sandals to come with those light blue shorts.
The mare breathe quietly into your shoulder; she was clearly asleep. Naturally, this caused the mare to become much heavier than normal, to the point you were practically stuck here. At any rate, this was some very bizarre ‘friendship studies’. But to be quite honest, you didn't care. Twilight Sparkle was technically your landlord. A very nice landlord that made you breakfast every morning. If doing friendship studies with her was the equivalent of paying rent, you were more than willing to do so. Even if some of these friendship studies were downright stupid, such as sucking your cock as part of a friendship lesson. But again, you didn't care. Twilight was a nice, pretty unicorn with a lovely fat ass. So, you were more than willing to go along with this friendship bullshit if it meant you could get laid.
You found yourself staring at her lovely ass below. You could not look away, especially with the sight of her tail wagging back and forth excitedly during her sleep. You came to the conclusion she must be dreaming. You felt butterflies flow through your stomach, at the sight of it wagging. It was quite simply adorable.
You needed to pass the time. For it looked like you were stuck here for quite some time with this lavender unicorn sitting on you. So you decided to pass the time by feeling up her ass. You moved your hands down a little over her rump, you watched in delight as the sunken depression quickly faded away above, as her ass returned into a perfectly round, smooch shape like that of a still lake. Your hands resting lower on her rump subsequently sank into the plush bubbly softness of her ass, before reaching her ironclad, muscles deep beneath. You loved this soft, purple marshmallow pony ass.
Deciding to be a little bold, you pulled your right hand away from Twilight’s buttcheek. You held your hand in place, just a few inches away from touching her asscheek, taking a moment to appreciate the sunken depression you left quickly fading away, as her asscheek returned to a perfectly smooth shape. You then pulled your hand back a good bit further, before making to give her a firm slap upon her buttcheek.
Somehow… time seemed to slow down. You saw your hand strike her cutie mark on her asscheek in slow motion. Subsequently, you saw a rippling effect like that of a stone being thrown into a lake at the impact zone. The force of your slap caused her asscheek to smack against the other asscheek with a delightful, meaty slapping sound of flesh, slapping against flesh.
Time returned to normal, and naturally this butt slap caused Twilight to stir. The mare groaned, slowly lifting her head to look at you, a grumpy frown on her face.
“Anon, I was asleep. Why did you do that?” she said in a stern voice.
It took you a moment to answer her. “I…. I wanted to play with your ass.”
The mare smiled, a pink blush lighting up her cheeks. “Well, I guess we could do some advanced friendship studies today. How do you feel about mounting me from behind? Mounting a unicorn is perfectly safe from behind. I hope you won't be too afraid. Just know that when a female unicorn climaxes, they–.”
“I want to make love to you in the missionary position.”
Twilight tilted her head to the side curiously, her ears flickering intensively. “What is the missionary position?”
“Basically, it’s a position we lie down face to face, while making love.”
Twilight gasped, her mouth forming an ‘O’ shape, and her eyes widened in alarm. “Anon! Are you insane?! I will end up vaporizing you with my cum-laser!” came her panic laced voice.
“Cum-lazer? What the hell is that?” you asked.
“A cum-lazer is when a female unicorn ejaculates. This cum-lazer is a deadly particle beam that blasts out from their horn, which is strong enough to vaporize somepony into ash. Fun fact, an alicorn’s cum-lazer is strong enough to blow up a planet.”
“...” you simply said. You had no idea what to say.
Twilight’s ears drooped, and her lower lips began to quiver, along with tears beginning to fall down her cheeks. “You are not going to reject me just because I fire a cum-lazer out of my horn, are you? It’s perfectly safe to mount a unicorn from behind. I just need to cast a warning spell, to make sure pegasi know to stay clear of the area.”
You lifted your right hand up away from her asscheek, and quickly brought it to rest against the side of her cheek on her face. Twilight made a happy sound like a squeaking dog’s chew toy upon your hand making contact with her cheek. Her cheeks blushed profusely, lighting up with a pink colour.
“I like to live dangerously,” you said softly.
