The Undeniable Truths (of the Time Traveling Mechanic and his Trickster) (слэш)

Loki sacrifices himself in endgame to save Tony, coming "back from the dead" one last time. Tony's not expecting it. In fact, he'd been planning on dying to defeat the purple monstrosity so that he could join his soulmate wherever he ended up.
Now without the trickster, his life has no meaning. Tony decides to go back in time to help his loves younger self avoid falling into Thanos' hands. He expects it to be difficult judging by Loki's stories of Asgard and Thor before he was banished to earth. Befriending the younger Loki should be easy right?
Everything makes his objective harder.... Especially the fact that a younger Loki is a slippery little bastard, hard to pin down and even harder to connect and talk to without shooting himself in the foot or exposing his true purpose.
He just wants to make life better for his God. Everything spirals out of control once Tony gets a good hard look at Loki's life as a second Prince.
*** PLEASE READ THE TAGS. DEPRESSION AND DEATH OF A SOULMATE IN THE FIRST CHAPTER. IT GETS BETTER I PROMISE!!!***