Ian is an adept magic user but his rival, Jae, always teases him that he doesn't take any chances with his work. Finally having enough, Ian does the research and summons a demon he can show off to Jae to prove he can do something risky. The demon Ian ends up with is an incubus named Alistair; and a sexy romp progresses from there.
This short novella gives you exactly what it promises; a smutty romp with two guys and a demon. It has the sort of pacing that occurs when you need to get three men in bed and naked in under 50 pages; rushed and dirty. But, yeah, that's the price of admission here, folks. You don't get short erotica for the character development. Alistair is my favorite by far, of course. He seems to have the most personality out of the three.
What made me stumble was the replacement of pronouns like "his" "him" and "he" with "ze" and "zir." I just rolled with it after awhile. If you are looking for a quickie with some magic and fun, 'Rule of Three' isn't half bad! A little short for $3.99, in my opinion; but if you are looking for a m/m/m fantasy short story, you may want to check it out.