What about if the Blake siblings had already come down to earth? What if the hundred were all children? What if the Blakes were immortal? What if everything results in Bellarke? :)
Harry, Ron, Ginny and all their kids are going on a day out while the weather is nice but while on the motorway another vehicle hits their own and Ginny and Ron die. Leaving Hermione and Harry alone with their kids, as they try to get over their loss but will they get even closer or separate during mourning. (Rated T for: Possible language and references)