They didn't even get married.. He just convinced her he likes her and she is dumb girl who was like oh he is similar to me because he read a story book and then was OK for him to fuck her.
Yes that's pretty much it. He got her pretty fast.
How stupid! This manga doesn't have one but of logic!
*bit
Very
Easy peasy rollercoaster...
So much to the sex only after marriage part. ╮(￣▽￣)╭