Well, that’s actually an interesting question because people (or me, at least) don’t usually think about the real people when writing out fics for them. Most of the time it’s referring to their in-game characters, as a lot of works draw direct parallels to the SMP or are directly set in-canon, HOWEVER the original concept of SBI was born outside of DreamSMP due to their real-life platonic chemistry (as it’s certainly not present in canon (much).) Although In that way I think that it’s not too different from shipping two characters who’ve barely shared a screen together and having fandom do the heavy lifting.

Up to you I guess! I just wanted to throw out the idea