Dirty Filthy Fix (Fixed #5.5) by Laurelin Paige
I just finished reading the Dirty Duet and I was recently introduced to Laurelin Paige's characters and their worlds.
This is novella is about one of the partners of Reach, Inc, Nathan Sinclair. He is rich, mature, creative and incredibly handsome. He has been living in Japan for a while and meets Trish in a very sexy party that she is one of the fixed attendants.
Trish is a free soul... She likes dirty and without any strings attached.
However, when they meet it is combustion and together they have the hottest scenes I have ever read!
Nathan and Trish are a duo worth reading.
This is a standalone, but there are several characters from other books of this author.