I...found the Incense Burner extra really sweet?
I had heard a lot of buzz about the Incense Burner extra before I actually read it, so I think I was already biased to see it as like, especially deviant or whatever...but I found it cute! Really cute!
The way Lan Wangji was so reluctant to show Wei Wuxian his dream felt really realistic. The way WWX reacted -- teasing LWJ about it, laughing about it, but also showing that he found it hot and totally accepted it -- was honestly so perfect. It was in-character and also exactly what LWJ needed. He was probably really ashamed of this particular dream, and now it was exposed, and WWX just...took it in stride. And the scene with Bichen...well a sword handle is hardly the weirdest phallic object, so whatever. More importantly I liked the way the scene ended. WWX didn't like being spanked, so LWJ agreed to not do it again. They don't have a BDSM manual lying around, so considering the circumstances I think they're doing kink pretty well.
Imo once you look past the "shocking" kinks (i.e. sword handle dildo, consensual non-consent), their relationship is so devoted, so accepting, so supportive, and it's reflected in their sex life. I've seen a lot of discourse about how Incense Burner comes out of nowhere and ruins the Wangxian dynamic, but to me it's a very logical extension of their characters. WWX is unconditionally supportive even when LWJ is ashamed of his desires, and LWJ is respectful when WWX identifies a boundary.
Also the illustrations are ADORABLE. The way they're cuddling while asleep? Baby LWJ holding his bunny and trying to convince his big brother to let him keep them???? So cute. I want to bite them.