I'm not all together sure what ultramale is, but the guys in this book are vampires. Is it a vampire romance/erotica book? Not so much. There are allusions to them being vampires throughout, and they're called "Brothers", a la J.R. Ward, but there's no vamp biting action until the very end of the story, and I mean the last few pages. To me, this is a problem. Vampirism in romance isn't something you can just add, like an ex-girlfriend or a preference for pizza. It seems odd that the males being vampire wasn't a much bigger deal.
The book seems to be more BDSM erotica, but it only really works on that level with the one Master named Zane, but he's made out to be the bad guy in the story because he's too rough on the subs. I didn't think he was rough and I liked his scene with Wynne. Dierk and Rolf (can I tell you how much I hate these names!) are brothers who fall for Wynne, but Dierk can't have her because he's forced to be with another female, and Rolf isn't who Wynne wants. She wants Dierk.
Wynne is pretty lame, but Dierk and Rolf have something hot about them. And Master Zane, of course, is made out to be hotter than hell. (What is it about the name Zane?) The problem is that at no time did I really care who she went with. She's supposed to be a shy thing, but she strips down in a dungeon the first time she's told to. Now that's submissive! But it's not terribly interesting. And then when she should keep her mouth shut and be a bit submissive around Dierk's king (remember, they're vampires), her big mouth is yapping and bitching all over the place.
Confused? Well, the book has very little conflict other than people wanting what they can't have, so after a while, I was confused too. Wynne is new to the BDSM scene, and it seems her submissiveness turns all three of these guys on. The problem is that none of the sex is very erotic, and the rest of the story is just a bit flat. And although the book gives a warning that this is a "sexually explicit" book, I found it a bit tame.
Perhaps I'm just getting jaded with this genre.
Overall, Decadent Master, which by the way seems to be a misnomer for the book because I can't figure out which man was supposed to be decadent, is an ok read, but not for the money I paid for it. For that, I expect more than a 236 page book that lacks conflict and gives me lukewarm BDSM and sex.