Harem of Sorcery Series by Lana Ames

When Emma Foster goes to a costume party at a mansion, she never dreams she'll meet such a hot guy...much less four of them. And she has REALLY never imagined herself with a harem of men. But when a mysterious sorceress needs her help, who is she to say no? Especially when that help turns out to be so...delicious.

Grace French's new friend Emma Foster has told her a very interesting story...about Emma, and about Grace, and about demons and sorcery...and harems of men. Ridiculous. Grace is having none of it. That is, until the guy she's had a hopeless crush on for a year unexpectedly asks her out--and introduces her to a few of his hot friends...and suddenly, Grace finds herself in a world she never imagined. And loving it.

The super-hot conclusion of the Harem of Sorcery trilogy! Rebecca is a practicing witch--and already literally fighting demons--so she isn't fazed when the mysterious Lady Periwinkle asks for her help with a demon problem of her own. Granted, the sex magic thing is a little more unusual, though intriguing. But when Rebecca starts binding her harem of men, she quickly finds that the situation isn't at all what was described...in so many dangerous, and smoldering hot, ways.