I can't really summarize this with out giving it all away so I'll just say this It starts off as the Scout (Alexander) and the Femscout (Elizabeth) they grew up together and start to like each other more as more then just friends it will involve the rest of the TF2 Characters in later chapters now it starts off slow going through their childhood just bare with me.

What if two humans were in the Underground at once? What if one human was DETERMINED to stop the other? What if they could both SAVE? What happens when an Unstoppable Force meets an Immovable Object? When a certain scientist pulls enough of himself together, he finally finds a way to stop the destruction of his world. (PLEASE READ THE REWRITE INSTEAD.)

When Engineer finds himself alone and heartbroken after his wife unexpectantly leaves him the enemy Spy takes it upon himself to help the man forget his problems. Whether he likes it or not.