There are 2 books in the The Agency series. The newest book is Agents of Winter which came out in 2022.

1
His Quiet Agent

Book cover of His Quiet Agent
Arthur Drams works for a secret government security agency, but all he really does is spend his days in a cubical writing reports no one reads. After getting another “lateral promotion” by a supervisor who barely remembers his name, it’s suggested that Arthur try to ‘make friends’ and ‘get noticed’…
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2
Agents of Winter

Book cover of Agents of Winter

Arthur and Martin have settled into a quiet life, orbiting each other both on the job and off. Still in recovery from his last devastating mission, Martin is adjusting to his new reality as a permanent desk jockey at the Agency while Arthur is adjusting to his deep feelings for…