Responses
I'm not quite sure either but from what I read in the comment section, Ci Nian has a Persistent Mullerian Duct Syndrome so Ci Nian have a female reproductive system including uterus , cervix but physically they have men's body and also most of the cases they dont have female genital+- I CAN'T REALLY EXPLAIN THE DETAILS PRECISELY BUT YOU CAN SEARCH IT THO iF U LIKE,
Anyway I think he did it with Ci Nian's ass so maybe that's why

One thing I don’t understand is how Cheng got him pregnant but doesn’t know he’s intersex, that doesn’t make any sense? Or is it that Cheng knows he’s intersex but not that he got him pregnant? Cause from what Ci Nian was implying in his thoughts was that Cheng would be weirded out if he knew he was intersex. I’m a little confused about that