there was a teleport that you and Naruto could come through to get from Shippuden to Naruto OG, when you both walked inside, you saw you and Naruto but younger

younger Naruto:"who are you guys, believe it?" he asks, confused

Naruto:"umm, it's hard to explain, ya know? I think we came through teleport and we did somethin', but I forgot" he gets a anime sweat drop

younger you:"wait? but how did that happen?" younger you, asked confused