Based on a gifset I saw on tumblr. Steve meets Jack back in the 1940s.

When he first crashed into the ice, his head had been a whirlwind of regrets and missed opportunities. But the biggest of them all, the most pressing and desperate and fierce, was the fact that he'd never see Captain Jack Harkness again. It now appears that such a sentiment was unnecessary.

Captain Jack and Captain America meet twice in there lives once during World War 2 and once during Steve's time as an Avenger, Small Sherlock crossover if you know what you are looking for, No Slash rated T for Jacks Flirting Disclamer don't own either Torchwood, Captian America, or Sherlock

There're not many people who could understand what it was like to be forced into the future. It's lucky for Steve that he'd once met a man with a dazzling smile, who just happened to be sticking around for a while. Steve/Jack slash.