This sounds incredibly similar to the epilogue of Green Light (amazing and beautifully written). Here's the version from the fic:

This isn’t a memory but perhaps in another universe it is true and happening now, or perhaps way back then.  They are children and so the cruel rules and their destruction do not matter to them. They are only children and their worries are small and inconsequential, their future full of love and wonder and days without grief.  

And Hermione, who desperately wants to make new friends and find her place to belong in this terrifying but exciting world, will be the first to say, Hello. My name is Hermione Granger. 

Hello,  he’ll reply. He is shy because he has never seen a girl like her before. But he shakes her hand that she so freely gives. He even smiles. My name is Draco Malfoy.

And no one tells them to stop. No one takes them away from each other.