Unnatural Selection Series by Ann Somerville

Four years ago, Nick Guthrie nearly died from a brain tumour until he received an experimental treatment that saved his life, even though the treatment brought bizarre and permanent side effects. Now he drinks fake blood to live, and has had to have his new long canines capped, but it's a small price to pay to keep doing the job he loves. He's a cop, part of a London Met Police Murder Investigation team. His current case involves trying to find the person ritualistically killing gay 'vees'... moreFour years ago, Nick Guthrie nearly died from a brain tumour until he received an experimental treatment that saved his life, even though the treatment brought bizarre and permanent side effects. Now he drinks fake blood to live, and has had to have his new long canines capped, but it's a small price to pay to keep doing the job he loves. He's a cop, part of a London Met Police Murder Investigation team. His current case involves trying to find the person ritualistically killing gay 'vees'. With no witnesses and no clues, the police are stymied, but Nick won't give up until their killer is found. Complicating his life is Dr Anton Marber, an attractive, gay minor celebrity Nick saves from being kicked to death one night. Nick doesn't expect to see Anton again, but Anton is amazingly stubborn when it comes to things that are important to him, like Nick's case, Nick's diet and Nick's determination never to fall in love again. less

In the sequel to 'Unnatural Selection', Nick and Anton have settled into a comfortable arrangement with Nick dropping over on his free days for sex and company. This suits Nick just fine - even though he knows Anton wants more. Attending a glamorous event pushes them into the public eye as a couple, leading to unmerciful teasing from Nick's friends... moreIn the sequel to 'Unnatural Selection', Nick and Anton have settled into a comfortable arrangement with Nick dropping over on his free days for sex and company. This suits Nick just fine - even though he knows Anton wants more. Attending a glamorous event pushes them into the public eye as a couple, leading to unmerciful teasing from Nick's friends. He doesn't mind too much until the attention turns deadly, and he must discover who's harrasing his friends and lover, before somebody ends up dead. less

In a sequel to 'Every Move You Make', Nick and Anton have settled happily into married life. But on the eve of their 3rd anniversary, Nick disappears, apparently leaving Anton for another man. Anton refuses to believe it. His search for the truth takes him half way around the world, while Nick's friends work to discover what really happened to Anton's husband. This novella is the third story in the 'Unnatural Selection' series.