Someone deleted my original post for some reason or another. Putting it here instead.
 
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I can just picture AJ smirking at the guy fucking her ass, pausing only a moment to give a few wet slurps at the cock in her mouth. "Aw, that's adorable, sugar cube. Did ya'll think you were gonna make me squeal that easy?" She only chuckles lightly as you redouble your pace, as much at her words as from the maddeningly warm, soft, tight grip of her ass on your dick.
 
"Mmm, that there feels real nice... Ah love a good roll in the hay. But can ya go a little harder? Afraid I'm gonna need a little more from ya, partner."
 
You bend over the mare, widening your stance and balancing yourself with both hands firmly on her hips, and beginning fucking the earth pony for all you are worth, a tiny grunt escaping you with every thrust. AJ's ass ripples around your length, her ring still tightly clinging to your shaft despite the ease with which it stretches to accomodate you. You groan every time your body rocks into hers, her ass easily taking your full length all the way to the hilt. It isn't too long before you're panting and sweating, dick twitching and balls churning in the hellishly perfect pleasure of AJ's depths.
 
She still simply looks back up over her shoulder at you with a faintly smug smile, not looking the least bit mussed. Her taut, firm flanks ripple ever so slightly every time you slam into her, but the rest of the earth pony's body remains unfazed.
 
"Well, darlin', I guess it looks like makin' me squeal might still be a bit too much for you. But, I wonder..." You gasp as suddenly your entire world -constricts-. AJ's flank muscles flex visily, and your previously-easy thrusts grind to an immediate halt as the earth pony clenches down on you with a body toned from magic and a lifetime of manual labor. "... if ah ca make YOU squeal?"
 
You gasp again, and again, and again, as AJ's muscles go to work, rhythmically flexing and working around your shaft. Her walls clinging to every millimeter of your dick, massaging it, clinging to it, and it's all you can do not to blow your load on the spot. Weakly, instinctively, you try to pull back out.
 
AJ's muscles lock down around you, pinning you in place before you can escape more than a couple of inches. "Whoa there, partner. You started this, an' now, you better believe you're gonna finish it." Your only exit denied, your body's urges very quickly assert themselves as to where else you can go, and AJ's muscles noticeably relax as you slide back into her, fully hilting yourself in paradise once again. "There we go, attaboy!"
 
Satisfied with having made her point, AJ doesn't keep you waiting any longer. Her grip on you relaxes, just slightly, and she leans kneels down on her front legs to present her backside for easier access. Her muscles roil and twitch around you, massaging at your deeply-buried prick, relaxed enough to let you move but still tight enough to make you work for it. When you catch her gaze looking over her shoulder at you again, there is no longer anything gloating about it: a warm, friendly, affectionate smile graces the cowpony's freckled face. A wordless encouragement to let go, and do exactly what you're longing to do.
 
And as you bury yourself inside of the earth pony's ass one last time, and her walls clench down hard around you, that's exactly what you do.
 
You can't help but let out a long, low, cry as you cum, rope after rope of piping hot cum painting Applejack's rectum. Her satisfied moan matches you, a spare hoof working eagerly at her enormous clit as your cock twitches and throbs in her grip, and you spot a small trickle of marecum flowing from her puffy sex to match the flow of your seed into her ass. AJ's muscles milk you for all they are worth, keeping your orgasm going for longer than you ever imagined possible, not spilling so much as a single drop outside of her. The thought of your cum remaining entirely inside of her, her body fully absorbing every last drop of your essence, is enough to prompt another weak groan and thrust, a final few ropes of cum shooting into her clutching depths before you collapse, spent.
 
"Ahhh.... sure do love that feelin'. Thanks, sugar cube." A pair of soft, warm lips press to yours, lingering there for just a moment before Applejack pulls away. "Well, anyway.... reckon it's time for me to get back to work. But if ya ever wanna try yer luck again.... ya'll come back now, ya hear?"