Yes, Captain America and Peggy tie the knot in certain comic arcs. This event adds depth to their love story and has a big impact on the overall narrative.
The theme of sacrifice is quite prevalent as well. Both Steve and Peggy have made sacrifices in their lives, and fanfictions often explore how those sacrifices impact their relationship. It could be Steve sacrificing his normal life to become a hero, or Peggy sacrificing her own personal desires for the greater good. These themes add depth to their relationship in the fanfiction.
One great piece of Captain America male Peggy fanfiction is 'A Different Time' on FanFiction.net. It really delves into an alternate universe where their relationship unfolds in a very unique way. The author does a wonderful job of capturing the essence of both characters.
There's also the story of Steve's first real mission as Captain America. He was sent on a USO tour at first, but when he got the chance to fight in the real battle, he showed his true courage. He didn't care about the danger and just wanted to do his part to save his comrades and fight against the bad guys.
One idea could be a story where Captain America and Captain Marvel team up to face a new cosmic threat that's headed towards Earth. They have to combine their unique skills, with Captain America's strategic mind and combat experience on the ground, and Captain Marvel's incredible cosmic powers in space battles.
He could also meet Odin. Odin might view Captain America as an interesting mortal from Midgard and might have some words of wisdom or a task for him to complete during his stay in Asgard.
Sure. In the comics, after Steve Rogers was believed to be lost or incapacitated, characters like Bucky Barnes and Sam Wilson have taken up the mantle of Captain America at different points.