It's Not Fair That Our Stars Crossed - StarCrossed, #1

Raenya Lynch was an ace assassin taking assignments directly from the biggest mobster in the galaxy. Vincent Ronald was a well off programmer in one of the biggest international companies on Earth. Their fates were entangled when Raenya was sent after him for an assignment, only for the hand off to fall through when she had to kill the entire gang after it was made apparent she wasn't supposed to leave the meeting place alive.
Immediately slapped with a sixty-million net bounty, Vincent was forced into a partnership with Raenya in order to stay alive. Their goal: kill her old boss and dissolve their bounties.