Where to begin... I discovered your story on the weekend and read the whole thing through in one sitting. I can't begin to tell you how good it was to find this pairing, and so well written. Made my day to see you'd added another chapter :)
Regarding Ulvhedin, I believe I can help. 'Ulfhedin' (plural 'Ulfhednar') refers to Norse warriors, much like the berserkers, who went into a kind of mystical rage on the battlefield, donning animal pelts and invoking the wild spirit of the beast (bears for the berserkers, wolves for the ulfhednar). While they were in this state, they were stronger, more fearsome, and said to be immune to pain. Ulvhedin is actually a rather fitting name for Hoest, I think, as it refers to that ritualistic transformation into something powerful and aggressive; like a number of black metal musicians, he seems to go from being quite reserved offstage to wild and aggressive onstage.
I *really* love the fact that Niklas keeps using this name for him. It seems like a possession thing...I feel that Niklas uses it precisely because no one else does. He is Hoest to everyone, but Ulvhedin to Niklas alone. Secondly, it's deliciously mocking. He calls Hoest 'Ulvhedin' while completely undermining his power and control, even denying him the ability to use violence in any effective way. I see this as why it makes Hoest so uncomfortable every time Niklas uses the name.
Anyway, sorry for such a long message! I could write pages but I'll stop there, haha.
—Claza, for bromanceisbrutal's Submit to Self Destruction