How We Met Our Mother

Lorcan and Lysander are in trouble. They accidentally caused their parents not to meet, and it seems that the more they meddle, the more Luna falls in love with Neville Longbottom, whom she met again instead of their father. The only person who can save the twins' lives is Rolf Scamander. But how do you go about telling someone that you're his kids from sixteen years in the future?