I bet they would've made another child if they weren't interrupted. Poor Nishikata seems like the type who'd really get into something but has a big problem with being self-conscious.
The author really trolled us with this manga. How does the MC have no character development since they were kids? That kid might not even be from our Mc lol
I bet takagi tricked nishikata like : lets have a contest; if you can make me pregnant you win! And of course nishikata going for the win he.....Well you know hehe