So a yaoi author writes a regular, non-yaoi manga. That's all fine and good. But apparently, she is unable to contain her hornyness. Apparently he just has to draw some shitty porn. And so she make a doujinshi for her own series.
Doujinshi that doesn't fit the series at all. Doujinshi that brings gore, torture, necrophilia and the worst, cringy-ass yaoi drawings. It goes way beyond S&M, it's just guro. You might wannabe cute short comedy routine at the end with wannabe cute faces, but it is still a fucked up guro. As expected, there is no actual story - it's just a priest raping
a vampire. Then killing him, then raping him again. That's it.
I could still kind of understand if this was fanmade, but to make something like this to your own series... seems like the "rotten" part of "fujoshi" really is no overexaggeration. Though to be fair, this was the first time I've seen someone not only use a gun as a dildo, but even firing during such act.
Basically, stay away from this unless you're a lost cause of a fujoshi.