Did Cap and Black Widow ever hook up in the MCU?

Cap only falls for women who share the DNA of Peggy Carter. Nat never had a chance.

No.

But I wonder if Chris Evans and Scarlett Johansson were ever more than just friends.

They definitely banged off-screen, it’s not even debatable.

No they didn't. It was always a very trusted friend type of friendship

Just because they spent time together doesn't mean they'll start banging now that's not how it works. Otherwise she'd never leave Barton's crotch.

I misread Black Widow as Black Panther.

No

They're platonic.

The playfulness between Nat and Steve in TWS was one of my favorite parts of the film.

No. IIRC in the behind the scenes of Civil War it was confirmed that they have a brother sister relationship. They're just really close friends. Nothing more.

No, they are friends and hold each other to extremely high standards of respect, that’s why their dynamic is very cool.

Pretty sure they danced

Honestly in Winter Soldier, it seemed like they were hinting at a potential romance, but I guess they abandoned that in Age of Ultron.

There was that one time when they were training together and black widow slipped and landed on captain americas hundred year old wang.

They're relationship seemed possible during TWS but AoU sort of ruined it with forced Hulk BW shipping thanks to Whedon.

In TWS prequel tie-in comic they actually dated on and off the missions and he melted her with a milkshake in Brooklyn despite them being just fake dates they flirted a lot.

Its pretty clearly no. Not outside that one time they kissed to hide from Hydra agents.

Poor black widow, I’m excited for her upcoming prequel movie tho!

Friends only and while both wouldn't dislike more they cherish their friendship above all

It would've been cool if they did. They're chemistry was flawless in The Winter Soldier.

If anything they would have made a better couple than him and Sharon and Nat/Bruce.

For 3 seconds, to hide from rumlow

Nah, but I think they would have been a could couple if developed correctly(Like most couples).