What can he say to that? What can he even say to any of that? This man took the best that Jack had to give, every reason that Jack, himself, thinks he should die, and Luffy is the first person to refuse to kill Jack Harkness. Every failing he's had, every death that's followed in his wake, and Luffy says no. Even the Doctor, the man that Jack would follow into any danger, has never hesitated to allow Jack to throw his life away.

All Jack can do is accept everything that Luffy is, right back. Captain's damn orders.

"I- I won't lose it." Soft. Almost defeated, after what he's had to say before.

"I'll see you again." Firmly. It's so strange to be the person on this side of this feeling. Letting someone else take the fall, and not knowing whether they are the one to come back.