Reversal of Fortune — Keegan Kennedy

Toxic bachelor, Brock Capwell has had his wings clipped. Following a family scandal, Brock's grandfather attempts to rein in the wealthy jock by changing his will and making Brock's inheritance conditional. As part of his penance, the heir is forced to take an entry-level job as a nighttime security guard for the Capwell family's oil refinery and warehouse under the strict watch of his new boss, Murdock Baker. When Brock overhears Murdock on the phone discussing blackmail, he realizes that there is far more to the gruff former Marine than meets the eye. This short novel includes dominance, submission, bondage, blackmail, and chastity.
This is the complete series - all four parts in one compilation.