Responses
I think all women has been given long lasting (at lease until 10 month) birth control drug when they were 1st kidnapped. (Maybe, and mangaka forget to mention???)
Otherwise the girls wouldn't scream to "cum inside" is comment sense that you can get pregnant w/o protection.
But then again this is just a manga,and the mangaka probably just want to put erotics stuff w/o minding the details ╮(￣▽￣)╭
But the girls would not be pregnant...
are these women on birth control? (i don't see any condoms)
there's gonna be a lot of babies at the end of the 10 months (if they survive) (￣∇￣")