You finally decide to live your fantasy, you slide your throbbing dick out after you had enough sex, then gently pull her pussy open with your hands, giving you a good view into her snatch, it was huge! more than enough for you to enter, you thought.
You slowly started pushing your hands into her pussy, she grunts a bit and looks back, then relaxes, she must be enjoying it a lot as much as you are, you smile and pull the flesh open wider, pushing your arms in, soon you were feeling deep inside, she moaned and grunted a bit as you kept going.
Next, you pushed your head in, you felt slight vibrations in the mare's pussy as the walls rubbed on you, next came your shoulders, spreading her pussy wider as you eagerly pushed in, you licked around some, causing the mare to moan louder and cum a bit, you taste it, the juices were sweet, you kept licking as you pushed your whole upper body in, on the outside it looked a bit awkward, being half inside the mare's cunt, but you were LOVING it, soon your waist pulled in, you moaned as your throbbing dick spurted cum as it slid in.
Next, you wiggled around, soon the mare orgasms and coats you in thick juices, moaning in pleasure, soon only your feet were left out, and you wiggled a bit more, slipping completely into the mare's pussy, you felt great warmth as the pussy entrance closed, and wiggled in deeper, licking and moaning.
Soon enough you spot a dome-shaped organ and you smile big knowing what it was, it was the mare's womb, pushing in deeper, the mare moans louder, you reach forward and feel the tender flesh, causing her to whinny, the cervix slowly opens, giving you a nice view inside. "ooh yeah.. that's what I want.." You moaned and rubbed her womb as she moaned, then started pushing your arms into the cervix, a loud, pleasured whinny escapes the mare and jerks slightly, but you keep pushing in, feeling the hot, but comfortable insides of the waiting womb.
In moments you had your arms and head in, followed by your shoulders, the rest of your body slid in easily, once your feet entered, you curled up, the cervix closes tightly shut, showing no sign of opening anytime soon, it is very warm in the womb of the shire mare, and it makes you sleepy, you rub the walss as she moans, then she lays down as you fall asleep... a few hours later you feel something and wake up, and you realize...