InfernalPanda
When Tony and Bruce manage to crack the secrets of the multiverse, Steve Rogers-of the universe named Earth-Ultimate-is sent through the portal to figure out why Earth-158's world flourished when so many others had failed. By chance, he meets Peter Parker, who is one major inconsistency between the two world's timelines, and Steve finds himself intrigued with Peter's apparent familiarity with Captain America.
The more Steve learns about Peter, the more he is certain the man in the mask is exactly what they need. He isn't sure how Peter will feel about that, though. In his experience, people from this universe were pretty aversive to Hydra. He can only hope he is able to convince Peter that they aren't what they appear before he puts Steve's loyalties together on his own.
*****
OR: Steve is from a universe where a less-terrible Hydra is control. He finds a Post-Endgame Peter and wants him on their team. Lots of heart breaking grieving and sweet, tooth-rotting fluff wrapped in a whole lot of plot!!