Sam stares at Zachariah flatly, clearly unimpressed. "Of course. Because that's useful. The chances of a pregnancy in the first year of a mating is only about ten percent because the chances don't go up until cycles sync up. So the chances are that you're already setting any union up for failure."

And considering the final say had to be Castiel's, it means he's setting the young Omega up for failure. Which will, in turn, only make it more difficult for him to have children.

He still dredges up a smile for Castiel, though. "I'm more of a salad man, myself."