Jack looked at the Doctor a long moment, then leaned in, kissing the nape of his neck, resting one hand between his shoulderblades a moment. Ran his hand slowly down along the Doctor's spine, flipping the cap off the tube of lube with the other. He met the Master's gaze as he slicked a finger, trailing it along the cleft of the Doctor's ass.
The Master returned his hand to the Doctor's hair, stroking, watching Jack, reaching out to make the connection with the Doctor again. Wanting, needing to hold onto that, to feel what was happening as much as watch it.