Intense interrogation and domination in 1960s Cold War-themed erotica

In the 1960s, during the Cold War, a man was accused of treason and subjected to brutal interrogation. His interrogator, a dominant female, used BDSM to extract information. The man, now her slave, was trained in deepthroat and bondage, his large dick the center of their twisted pleasure. This is Part 1 of their sadomasochistic tale.