The Other Man
Tom's zoning out at conn when he hears Kathryn husk, "I already have a man," and he looks up, startled. In his wildest dreams he would not have predicted she'd reveal their relationship like this, but when duty calls he is delighted to serve, so he swivels around and finds Kathryn looking… uh, not at him. At Tuvok. She's holding Tuvok's hand, while Tuvok seems to long to be sucked into the vacuum of space.
"I was right there," Tom grumbles later.
"I know," Kathryn soothes. "But did you see his face?"
And, well. It's hard to argue with that.