In it, Bucky and Steve meet during an online game of some sort. Bucky also streams his game playing and Steve starts watching his streams as well. I'm pretty sure it was a series, and in later installments they had to use creative camera angles so Steve could sit beside Bucky while he plays and not get outed on camera. It's possible that at one point Bucky was baby sitting his sister's daughter and he and Steve had to deal with the sister's abusive boyfriend, but also possible that's from a different fic.
It's not the one where they play Destiny. I found that one while searching, and it's an amazing fic, but not what I'm looking for.
Thanks in advance!
ETA: Found! It's the Streamlined series by nickel710.