^^ You can read their career stories via uma reader, but they actually have very little interactions together. Fandom love to ship them because Digitan is a full on otaku/himejo and Dober is a doujin artist
It’s either that the artist behind this is a legendary yuri shipper who consumes a ton of media, or they have a great fanbase constantly suggesting new ships to add… or maybe both.
^ Original is taken down, but an aggregator has it. (You might have to un-blacklist guro to see it which is frankly ridiculous for how little there is to see.)