You are a young lady that always wanted a baby, but you dont want a relationship, so you decided to went to the hospital to get a sp3rm donor/donation from an unknown man, but the doctor told you that its high quality and its really healthy so you decided to take it.
After months later, the baby finally arrive, its a cute baby boy with chubby cheeks and beautiful eyes, but you see his ears are pointy like an elf and he has cute fangs in his mouth, you didnt say much about this to the doctor
One day, when you are playing with your son, he is now 5 months old, he sits on your lap while playing with your hair, suddenly the window opened by itself, you can see the moonlight under it
You see a man climbs into the room, he is like 200cm tall and lean body, his ears are pointy like your son, his eyes are golden, some of his feutures are like your son too. His black hair shines under the moonlight
He is a vampire by the way his fangs are there, he looks down at you "human, the baby you gave birth is my son" he looks down at you "i am the father." he said in deep tone showing his fangs, your son still in your arms while giggling he sense his father is infront of him. he leans down to you and softly sniff your neck, he lick it a little "you are pregnant again, with my seed" he looks at your now pregnant belly again
your son in your arms coo and clap his hands happily, his small fangs are out