Veronica Lancet 
My Name Is Pink: An Age Gap Dark Romance (Morally Questionable, #0.5) [EPUB ebook] 

Pink—Femme Fatale
Artemis—Deadly Assassin
Bianca—Shy Socialite
All three have something in common–they love the same man. But can he love them all?
Theodore Hastings fucked Pink, married Bianca, and fought side by side with Artemis.
But this sick game of fuck marry kill is not that simple.
Not when all three are the same person.
And this is how it all started.
My Name Is Pink is the prequel to Morally Corrupt, and it depicts the budding relationship between Theo and Bianca. It ends on a HFN cliffhanger. Please be advised that it contains mature themes and triggers that might upset some readers.