*sighs* I am once again asking you to help me find a fic, please. It should be easy this time.

It was the one where Jon and Martin were childhood friends and pen pals, and then they stopped writing, and then when they met at the Institute they’re like ‘ah it’s my best friend’, and then they fall (back?) in love, and the tulips are blooming, or something. (The 'or something’ refers only to the last part.)

https://archiveofourown.org/works/28031181/chapters/68669928

Against All Probability, by CirrusGrey. It’s good! (I mean. Otherwise I wouldn’t be asking for its name so I could bookmark it.)