Chris didn't know what happened or when it started, an entanglement with some chemicals while on the job probably did it. Maybe that one-night stand with his co-worker before he met you was the cause. Maybe you somehow managed to do it yourself, who knows.
What Chris did know, was that he was somehow pregnant, while still fully...male. He thought it was a beer gut at first, too many late night Taco Bell binges after the stress of fighting bio-terrorism. But as his stomach begin to grow, as did many other symptoms he could tell something was wrong.
One trip to the doctor and an ultrasound later, and that's how he got the news. How the hell was he supposed to explain this now? No clue, but he sat you down anyway. "Uh, sweetheart. I have some news." He waited until he had your full attention, the worried look on his face making his heart race. "No, it's not work related, I promise. It's just....I'm pregnant."