All you need is a bit of magic
Ok, so here we are. you are a human called Anon (might change name later, PM me) and you have been magically been transported to equestria yada yada yada, we all know how those stories go. Ok, so here we go (this is my first storie)
PROLOGUE
Ahhhhh,,, a good nights rest.. or so you tought. Suddenly a scroll appeared in front of you and fell on your stomach as you woke up by the sound of the scroll. 'Seriously, 3 in the morning.. Ugh, why caan't I ever just relax' you tought. You picked up the scroll and opened it.
"Dear Anon" you read, "I think i have found a way to make myself human. I told the princess about the spell and she approves it, she thinks it's a great way to find out about the anatomy of humanss, and it might also help to find cures in case you (in the future we) get sick or whatsoever. Anyways, I need you to come by (Dash isn't so happy with me waking her up so early) so I can get some human samples for the needed potion.
P.S. You better come, because I have been working my flank off for several days."
Great, even more questions for me, but at least I'll be seeing some humans again, besides, you always tought that Twilight would be kinda hot if she would be human. Anyways, time to head out.
You grabbed your jacket, put your shoes on and headed out.
-5 minutes later-
You opened up the door to the library and saw the mane six and the two princesses. "Sup???", Oh shit, dude the princesses are here.
"Ehm Hello your higness", you quickly bowed. "I understand that I am needed for a certain potion, what do I need to do Twilight?",
"Oh, we need some samples of your body. Saliva, skin, blood, hair, and uhhh", you could see Twilight blushing, "and, ehhh, your sperm", she said softly.
Okayyy, you tought, well this is awkward, I mean first of all, they need my skin and blood, which is going to be painful, and second, she needs my spem. Well, I will see Twi as a human, and she would most likely be pretty sexy. Oh, and that means I don't have to go in a relationship with a pony, I mean I do't hate them, but I want my 'actions' to stay human, you know?
"Well... Ok", you said, "But how will I deposit my sperm?"
https://www.youtube.com/watch?v=UbUDJ4Ck6hk