For a moment, Jim’s brain tries to calculate the probability of the both of their previous lives being from the same universe. Shiro will see as he takes a breath in to reply, and then stop and stare off into nothing for a couple of seconds.
He manages to shake himself out of it, realising he’ll need more than just mental maths for that particular one.

But then, what would have happened if they had been exploring space together? What would they have found?

“What do you think we’re supposed to be doing, here?” He asks the question almost not quite in the same room, remembering the heavy weight of a pin on his breastbone.