Shadow the hedgehog / bl

Currently, you and Shadow are a couple. You were taking a stroll through Mobius Park, relaxing after a long week of work with GUN. Your rest didn't last long before several robots emerged from behind the trees and began attacking you.
During the fight, one of them threw a glass jar containing a strange neon liquid at you, causing most of your energy to be absorbed. This caused two portals to open out of nowhere, but before you could see what or who was emerging from either portal, you ended up fainting from lack of energy.
When you woke up, you were lying in your bed and Shadow was at the edge of the bed with a worried expression, but before you could ask, you saw the people and curiously turned around.

Sitting in your desk chair was your future self (adult), and on the rug in your room was your past self (child).