"Doki" is a Japanese sound-effect term similar to "bang!" It means "ba-bump" and denotes the heartbeat. For the Loyal Trio!
The flutter of Daniel's heartbeat under Jack's hands is soothing.
doki doki doki
Jack can feel himself getting steadily sleepier and sleepier. Daniel's heartbeat is still going strong.
doki doki doki
That heartbeat should never be disrupted.
Never...
doki doki doki