Good addition to the series!

This chapter can't apply to all of your universes, as you said in the beginning. In the Twin Pines Universe, Marty would be dead at the time this happens, right?

This is a great story.

They already said "I love you" on their first date?

That was great! I can really picture Marty's birthday being like that. It makes me want to watch BTTF now. =)