A Second Chance at HappinessMaybe?

A stupidly curious Harry Potter accidentally ends up in the past ... right in front of Regulus Black. Deciding he might as well stop the world going to hell, a - slightly insane - Potter drags a bewildered Regulus with him. While ending a war and accidentally saving the Blacks, the two quickly get close. Will they have a second chance at happiness? Maybe? Slash, mentions of mpreg.