Ponies are so trusting. Under the guise of friendship, you can pretty much get away with anything. When Sweetie Belle started spending a lot of time at my place, nopony even batted an eye. Not even when she started asking for sleep-overs. Ponies are so damn trusting.

At the moment, she's laying on my chest, lips pressed against mine in a sloppy but passionate kiss. She's learning fast, but I'm in no rush for her to become an expert. To be honest, I kind of like the inexperienced way she handles sexy time. I think it’s because it reminds me of how wrong this all is, and that, in turn, excites me.

I let her explore the inside of my mouth, which she does with the energy and curiosity only a filly could possess. My hands grope at her warm, pillowy backside. As I squeeze and pinch, a stray finger might slide a little lower every now and then, prodding at one of her entrances, keeping her excited and reminding her of what's coming. My cock twitches as if for emphasis as it's grazed by a neatly trimmed fetlock.

Finally, that hot little tongue pulls away from my mouth, though her lips linger for just a moment longer, as if they’re reluctant to break contact. When she finally does fall back, Sweetie's cheeks wear a rosy red blush, and her mouth is twisted into an adorably goofy expression. Sweetie tends to make that face when she’s ready for penetration, as if she’s mentally preparing herself for me. Little things like that are exactly what I love about her.

“Um, Anon, Are we gonna..?” Sweetie’s voice brings me back to reality as I realize that I had just been staring at her for a while. Rather than answer, I give her a wicked grin, booping her nose with my own. Then, wrapping my arms around her in order to keep her steady, I bring myself to a seated position with Sweetie poised just above my eager cock.

Our eyes lock and Sweetie makes that cute face again. Without further ado, I give her what she wants. I lower her down so I’m pressed against her entrance, and then, moving down further, I let my length slowly slide into her. Sweetie bites her bottom lip as she stretches to fit me inside. She doesn't hold back a melodic, satisfied hum when I bottom out.

Interesting fact about ponies: stallions tend to have really big cocks. Okay, I know this probably seems like it came out of nowhere, especially while you're trying to think about tight filly pussy, but hear me out. The average pony cock is just a little over three times larger than that of a human's at adulthood, even though a fully grown mare only has about two-thirds the body mass of a human woman. So, why does this matter?

It matters because this means that a mare's vagina is pretty fucking versatile. Even a little filly like Sweetie Belle, who stands just past my knee and is maybe half my size standing on her hind legs, is able to completely fit my slightly-larger-than-average (for a human) pecker inside of her with no pain at all, while still being tighter than hell.

Blew my fucking mind the first time, and it never gets old.

As is our tradition, Sweetie takes a few moments to get comfortable, and I wait for her to make the first move. She tends to need a bit of time to get used to my cock before she starts to really get into it, and I’m perfectly okay with that. Watching her squirm and adjust herself with a scrunched up face as though she’s testing out a new seat is actually kind of hot.

I can feel the gentle pulsing of her heartbeat on my cock as she gets herself into place; my own heart starts to beat faster in response. Despite how often we’ve done this, there’s always something so special about fucking my little filly that makes it feel new and exciting every time despite going through all the same motions.

Once she’s satisfied with her position, she smiles sweetly up at me.

“How far in do you think you went, Anon?” This question is another cute little ritual of hers. First time I bottomed out in her, I made a big deal about how impossibly far in I'd managed to get. It must have made an impression on her young mind because now she asks me every single time.

“Right about... here!” I say, poking her belly somewhere just above her bellybutton and causing her to giggle. The sensation of her moving body is phenomenal while I’m buried inside of her.

She begins to rock into my pelvis then, and at long last, we’re fucking in earnest. I let her control the momentum of our thrusts, starting off slow. She slides about halfway up my length and back down, punctuating each new insertion with a soft little grunt. She likes to do most of the work, but I do help her along, lifting her butt a little each time she pulls out before thrusting back in.

I can see both in her expression and the acceleration of her movements that her pleasure is starting to build. She always bites her lip when she starts getting serious, which is my cue to pull out a little farther and push back in a little harder. I can feel her heartbeat getting faster, and that only spurs me on.

Soon, we’re in full swing. I pull out almost all the way now before each new thrust, and her eyes close tightly in anticipation of her climax. Her cute little grunts become sharper and more urgent, and her whole body begins to quiver.

When the already snug walls of her little pussy begin to tighten, I leaned forward and lock lips with her as her orgasm begins to overtake her. She squeals into my mouth as pleasure shoots through her body. The feel of her tightening walls and the rush of filly cum are what bring my own orgasm to fruition.

For a while, we just ride out our ecstasy, clutched tightly in each other's arms, my cock still spurting deep inside her. Eventually, of course, the pleasure subsides, but we continue to hold each other like that just because we like each other; post-coitus cuddles are important, after all.

As we lie there, I stroke her mane and think about how banal life in Equestria could have been if we hadn't started hooking up. Any reservations I might have once had about sleeping with a literal horse child have long ago disappeared; replaced instead with a deep feeling of general 'rightness' whenever we’re together. The rational part of my brain knows that these emotions exist mostly to justify my actions, but honestly, that part of my brain’s a buzzkill.

Our relationship moved past lust some time ago. What I feel for Sweetie Belle is definitely Love, with a capital L and everything. I don't care that most ponies think it’s totally wrong for an adult to be in love with a foal, because for the first time in a really long time, I feel complete.

Sweetie Belle and I are in love, and I’ll be damned if I let anypony get in the way of that.

Author's Note

Thanks to Snipinexpert and RyanBrony5 for proofreading and editing this chapter for me - it came out much better as a result! More will come... eventually. I'm not finished with this one yet!