Story in the pastebin:
 
Traveling down the stairs into the main hall below, the partying is clearly over and everyone’s mostly cleared out or gone to bed. One stallion is passed out sleeping on a bar table, and a griffon girl is just finishing her last drink. Scraps of food and spilled cider litter the scene, and chairs are in disarray. The nice waitress girl, who seems to be the only employee besides grace and some mysterious chef, is quietly cleaning up with an exhausted smile. Looking towards the bar, sure enough grace is hanging up her apron on a post. Her workstation is pristine, not a thing out of place and already cleaned. Turning around, she smiles your way slyly, and heads towards a door leading into the back.  
That’s your cue to follow, right? Well, you sure hope. As you come through the door, you find yourself in the kitchen. The lights are dim, and you scan the room… On the other side, grace stands by a closet door, with her head turned coyly. “I aint got all night, darling, I gotta be up right an early to open this place ya know.” With that, she shakes her plump flank, tail springing up as a strand of liquid stretches off her most private parts. Her puffy lips and glistening slit are already a lot, your mind flooded with the carnal desire to pump her full of your cock. Sure enough, your member is already sliding out of it’s sheath, meeting the cold air. “Ya just had to keep on tryin’ didntcha?” She smiles, before strutting into the closet.  
Wasting no time, you have to restrain yourself from literally running over to join her. As you reach the door, she sticks her face forward planting a wet, steamy kiss on your lips. Wrapping a hoof around your shoulder, she pulls you into the dark closet where you land overtop her on the ground. Toying with her, you press your leg between her thighs where you feel your leg immediately touch something hot and wet. Pressing into her, and sliding around, Grace lets out a small delicate moan you wouldn’t have expected from her. Your cock brushes against her somach as you grind against her soft supple coat.“A-alright now, I been ready to go hours ago. Can’t horse around all night, and with all that talk earlier and I couldn’t stop thinkin’ bout’ it. That’s real naughty to do to someone on the job, you know?”  
She pushes you up before flipping over, sticking her ass up. On full display, sure enough her pussy is absolutely drenched. It quivers in the open air, practically drooling for your cock “Don’t leave a poor girl waiting~” she coos. With some careful positioning, your hooves running over the sides of her soft body, you feel your head press wetly against her lips. Pressing into her groove, the sensation sends a shiver down your spine as your cock slips, missing the entrance as it grinds up her slit, covering it with juices. “a-aahh~n” She shudders. Pulling back, you carefully line yourself up again. Your hooves pull against her hips, and your tip squeezes in-between her folds. Pleasure overtakes you, as you sloooowwwwlly slide into her. It’s indescribable, as her pussy clenches with her increased panting, hugging every inch of your cock, bottoming out as you feel the flared head press against her deepest parts. For a moment, you just sit there, her pussy quivering on your cock, sending wave after wave of subtle pleasure through your throbbing cock. Sliding back, her pussy clenches down, wrapping tightly around you as you slide out of her. All but the head slides out, before you plunge back in, your thick cock pushing deep inside. Grace lets out cute sounds as you work into a rhythm. “God I- ahn%! ah- Don’t do this- ahnnn% En-Enough%!” she moans. With every thrust, she presses her flank into your hips, shuddering as you struggle to push more of your cock inside. You can feel it, you start to tense up- breathing becoming ragged as you hold back. Grace has given up talking alltogether, drooling as she moans out with each thrust. Mustering up her voice, she sputters “I-it’s- hahnn% safe….. t-today – Ah!”  
She lowers her head, pressing her hips firmly against you- Your final thrust pressing your engorged cock against the deepest part of her pussy. It clamps down hard, winking rapidly. Electricity shoots through you, and you feel spurt after spurt of cum flood from your dick. Every shot makes your back arch in pleasure. Grace is drooling, speechless as she tenses up. Her pussy is a quivering mess, as cum leaks down over your balls.  
You lean against her, exhausted, dick still warmly insider her still twitching pussy. After a moment, you slowly slide it out- cum dripping onto the cold stone tile. You’re about to say something, but notice Grace has either passed out, or fallen asleep. She’ll probably be up soon, you think to yourself. Exhausted, you decide it’s definitely time to get some sleep- well, rest inside the crystal. Quietly, you leave the exhausted mare, pussy still arched in the air, and sneak across the kitchen. On the way out, the waitress girl walks in nearly bumping into you “Oh, sorry! It’s really late, I wasn’t expecting anyone in here!” Nervously, you say “no no, no problem” and hurry off before you have to answer any questions about the scene she’s about to stumble upon.