@zpanacea sent me this suggestion:
Harry is a painter. The time comes when he can't paint because he lost inspiration and can't get himself to paint. When he was trying to paint again, he let his hand do the work. He looked at the finished product of his painting, it shows a lad smiling at him with ocean-blue eyes, and like beckoning him to be with him. When he touches the painting he got sucked in and finds himself in an unfamiliar living room with toys scattered all around (which is the Tomlinson's residence).
Alright, I tried to keep to the main idea but I had to make some changes to make the story work. Harry is a painter and after waking up with a dream fresh in his mind he paints the boy in his dream. When he touches the painting he ends up in a parallel universe with a boy named Louis.
Some smut warning, mpreg
Purely fictional
Last year of High School. Harry is a smart kid that skipped two grades ahead, which means that he's a sixteen-year-old in a class with eighteen-year-olds. Even if the subjects in school are more fun he's also that weird kid no one talks to.
At least until their Biology teacher Mr. Graham pairs him with the popular kid, Louis Tomlinson in Sex ed. They're going to take care of a doll for a month to prepare themselves for parenthood, or mostly scare them enough to have responsible sex unless they want to be teen parents.
Harry dreads the assignment, but then he gets to know Louis and maybe they're more alike than he thought?