Friends, Sokovians, countrypersons, lend me your reading eyeballs: I found an extremely sexy fic on Tumblr featuring my problematic fave Baron Helmut Zemo as not-a-villain. No murdered kings of Wakanda here, only a university setting in which the brown-eyed boy is a heavily-accented polylingual history professor.
Unburdened with the sadness of losing a wife and child, all he has is an ex-fiancee who didn't work out. (She's fine; she ended up marrying a Zemo cousin and presumably they're happy together.)
The stakes and angst level are low. There's an age gap - she's 20, he's 39 - but they're both enthusiastically consenting adults. It's the same age gap that Jo and Friedrich have in Little Women, honestly. (I refer to the book, not the 2019 film in which director Greta Gerwig cast French hottie Louis Garrel as the Professor.)
These links link to mostly text, perhaps with a few safe-for-work images. The text is explicit, rated M for mature, and most definitely not safe for work.
The author's social media name is J.D. ~ J.D., I salute you. If this were posted on An Archive of Our Own, I would definitely leave a nice comment and some kudos.