In this movie, which I am sure everyone at pregchan saw as it has birth scene in it at the end, the actress in one of the scene says something like, "dashte…watashi no omanko chimpo mirku nomasete…akacha chimpo mirku nomasete!" It translates to "come inside…let my pussy drink dick milk…let the baby drink your dick milk." http://ninpumamadaisuki.blog.fc2.com/blog-entry-94.html
Being that both of her kids are "porn-babies" (yes, she was pregnant twice and in one interview, she shows the first kid) and she did birth in porn videos, I have a feeling she was willing to do ANYTHING. Damn it! I am in the wrong country!
Fun Fact: Just in 2015, Japanese government banned CP. It was perfectly legal to own before. Now, they give you one year warning, if they catch you so that you can get rid of them. I don't care about such thing but knowing what the Japanese adult industry can do, I know there are videos (underground or extremely private) of pregnant women who are doing the unimaginable that we will never know about or ever see the day light. Dark web maybe?