Secret Child

(You are James Potter and this is a, sort of, Jegulus story) It is the first Wizarding War and one morning James is doing his usual routine with his infant son, Harry (not even a year old) when he finds a long letter from Regulus (James's boyfriend and also Harry's father, you choose if you address it or how if you want). The short of it is that the Dark Lord made a horcrux and if he wanted to make a safe world for their son and James, Regulus was gonna have to find it himself, but it means he was very likely going to die and he is sorry for leaving James and Harry and that he loves them more then anything in the world. James is devastated, but quickly realized that he wouldn't be able to do this or take care of his son on his own and sets off for Sirius's home ... Who still doesn't know that James has a child or that it was with his little brother, Regulus... YOU CHOOSE IF OR WHEN YOU TELL HIM THE TRUTH.