Sarah lead you out the barn and over to where the Owner and a few others were standing. They simply gave you 1 look and immediately agreed on breeder. It did actually feel a bit releaving to hear that. Sarah brought you back to the same barn, only this time, instead of your normal stall, you were placed into of of the larger ones, which was actually righr across from your mother's.
Sarah removes the harness and slips you a sugar cube, which you eagerly lick up off of her hand. While you are enjoying your sugar cube, you hear a noise from the front door, as 5 stallions are being brought inside and moved into the mating pen, one of which is Mark. His massive cock is easily 6 inches longer than the rest of the boys. And as for his balls... mmph. They were so huge, and exactly how you liked them. He was just so fucking sexy. And you were determined to make him all yours. Being the only breeder from your age group, meant that you had full pick of your future harem members, and the boys knew it. Each of them could smell your scent and all had gotten fully aroused by it too.
Sarah unlatched your stall gate once the boys were all secured within the mating pen. The moment the gate was opened, you ran out as fast as you could, quickly racing over to Mark. When you were near, you turned around and backed up towards him, making sure your pussy was on full display. This excited Mark to no end and he quickly mounted you the moment you were in range.
The moment his weight fell onto your back, you knew he was the one. Everything just screamed YES! Especially when his cock pushed into your pussy. It was a perfect fit and even though it hirt a bit, you made sure you took him all the way down to his sack. The full 24 inches were successfully burried inside of you, and you were in total bliss as you began to piston your hips in time with Mark's thrusts. You cried out in pleasure as you feel your ass slap against his balls your knees are beginning to weaken from the pleasure, and right as you feel you may collapse, a few farm hands rush in and secure a support harness to you and lift your weight with it. You are simply hanging in the air now, as your legs have lost all strength. Mark is still burried deep within your pussy too. Suddenly he lets out a cry and you feel a torrent of jizz spray out of his cock, quickly overfilling your womb, causing your stomach to look distended a bit, until it overflows your pussy completely. You cum just as hard too, however you quickly know that this time sadly did not impregnate you. However that means that you get to go again with Mark for a round 2 in a short while! You didn't want to risk any other humans beating him to it, so instead of unmounting and moving on when the harness was finally removed, you turned around and began licking Mark's cock and balls clean.
Seeing this, the horses removed the other humans from the pen. Years of study has proven that when a mare chooses to clean off the stallion's cock and balls, instead of just moving on to finding a new partner, it means she wants to make him her mate, and will never willingly let anything else besides him fuck her until she has had his offspring at least once, after which it is rather common for the mare to allow for other males to join into her harem along with her mate. However these males are simply "fluffers", as she will only cum for her mate, no matter how many times the other males fuck her. It is believed she is simply using the men for pleasure, while saving the breeding rights exclusivly for her choosen mate.
It ended up taking Mark 3 more tries that day before you finally were pregnant.