He's really a scene-stealer! What I especially love is the way his shading/coloration reminds me of another "wish-list" snake, a Dumerils boa. (Is it my imagination?)
Anyway, he's gorgeous...even better to know he's so sweet to hang out with.
The BCI I used to have would also hiss once in a great while when approached, & not "little" hisses either, but like with your snake, a little stroking would remind her
there was nothing to worry about, & she was always fine.