Thank you so much. :D I love how complex their relationship is, how many different layers there are to it. There are just so many different kinds of trust and affection and devotion between them. I'm so glad that it came through in the fic. I'd hate to simplify their relationship.

That's an interesting question, and I only realised now that I've never written the three of them together. I don't really think there'd be a conflict between Davos and Jon. Neither of them is the jealous type, I think, and I think they'd both jsut be glad that somebody else loves Stannis as well. With Jon, I could see some sort of "I'm not worthy and Stannis loves Davos so much more than me" feeling, but generally I think the three of them would get along great.
But I do think it would be incredibly interesting to explore how Davos sees Jon, or what differences there may be, from Stannis' POV, between his relationship with Jon and his relationship with Davos. You just gave me so, so many ideas for fic (and of course I'd also love you forever if you write something about them ;)).
I think a bigger problem for Jon would be Stannis' marriage to Sansa, which is also part of my headcanon. I don't think he'd feel bad for loving Stannis just like Davos loves him, but he would definitely feel somewhat guilty for loving his sister's husband just a bit too much. ;)