So the idea that everything goes smoothly and NO one dies. Thanos never gets to Earth, not to the Collector, Not even to Xandar. But it goes back further. Stony never has its boy band fall out. The Accords are never put into place because instead of an Ultron problem they immediately make Vision. So Pietro never dies. But that's not enough. You have to fix everything this time. Loki is saved from his fall and although things aren't perfect, both Frigga and Thor (and a little half assery from Odin) Loki is assured his part, regardless of his heritage, in their family.
This of course sets a course of events that are similar but all together different.
With Loki on Thor's side, but the Tesseract still on earth, Thanos sends one of his Children to retrieve the cube. He sends Nebula. And she's a true force to be reckoned, the Avengers are formed but this time they've a God a chaos and what's more chaotic then convincing the enemy to fight for him. Her hatred of her father and his understanding of being the lesser sibling makes her turn quick and unrelenting. But she almost exclusively works with Loki and she holds a distaste for thor.
With no reason for running and a decent form of comradery, the Avengers move into the Tower. And even though each Avenger has to share a floor, with the assistance of Loki and his magic, their are able to have a tardis like closet that has whatever they desire in it. An Archery field, a moving training room, a spa, the Universal Library, a simple door to Asgard and its counterpart, a door to Jotunheim. The Avengers, while attempting not to create too much damage, do not fear the retribution of it, because whatever they break, their resident Magic person can fix. This is made two fold when Wanda and Pietro join their ranks. The twins are of course reluctant at first, but Loki is the first person who has been able to teach Wanda how to use her powers. The three bond quickly and Loki unwittingly becomes their parent, not that he minds, he misses his children dearly.
Tony and Pepper. Although there were struggles and the incident with the guard bots. They are able to move forward, with the help of their new and growing family. Having anxiety and panic attacks, having actual listeners and having people to support them. They are all a mess, but together they can make it.
When Hydra rears its head once more, Tony is more than prepared to not only sever the Avengers' ties, but also sends a virus through the system that destroys most of the information SHEILD had amassed to keep it out of the hands of HYDRA. As a working group they are able to capture the Winter Soldier and Loki and Wanda, with the assistance of Shuri, begin to heal his mind. In a sign of trust on both sides. Wanda, Pietro, Nebula, Loki, and Bucky go to Wakanda to begin the healing process and an exchange of information. Shuri and Wanda quickly work though possible projects the two, with supervision of both Loki and Okoye, can create. Pietro and Bucky become a favorite of the children and are often found talking about their past and the struggles of the mind from being turned or almost turned into a weapon. Nebula often trains with the Dora Milaje. She learns from them just as much as they learn from her. She also tells T'Challa all the information she knows. About Thanos and about the intergalactic Nations.
Throughout this time King Odin (Mostly Frigga) and King Helblindi (With Byleistr) begin creating a solid treatise between the two people. Included is of course the Casket of Winters. A new wide system of trade begins and it is Jotunheim that holds out a hand to Midgard for Ally. One of the main trade exports is unsurprisingly Poptarts.
Byleistr visits Wakanda and immediately bonds with the other icy people, specifically W'Kabi. It is in the mountains that Byleistr begins to train Loki in the magic of ice and winters.
Which brings us to a head.
Thanos has decided that he has waited long enough and heads for Xandar. Before he can even get halfway there he is cut off by a fleet of Ravagers and Asguardians.
The Avengers, all of them, are in this battle. Even Spiderman, though he has been told to stay with Loki and Wanda. In the heat of this battle it seems all might be lost, but strange shows his greatest hand. He freezes time and he is about to tamper once again but a hand rests over his. He looks into the emerald eyes of the royal of Asgard and Jotunheim.
Loki just smiles and undoes the spell, he rushes forward and in a last gambit he is pierced through the heart by Thanos, but with his close proximity he slits the monster's throat.
As loki lays there slowly dying, everyone crying. Strange holding his hand.
"I can fix this. I can save you!"
And Strange understood that Loki knew. He knew the whole time. He remembered everything that came to pass. The had once happened. Yet now never would.
And Loki the smiled as his guise fell and his crimson eyes closed.
The nine realms wept for the trickster God that had fallen for them. And a warriors funeral was held in Asgard.
The Avengers returned to Earth and a memorial was made for the people who had lost their lives and at the top in golden runes was Loki.
Is was many years before the Young Avengers could even begin to become something. But it had all come to flourition when Strange opened his door a little boy with black hair greens eyes that held a mischievous glint.