God I really am enjoying how this is developing. It feels really refreshing what an adult the main character is. And having a smutty manga actually mention/establish birth control is such a nice touch.
But also me, for the 100th time a villainess isekai protag assumes the plot will take over and thus the love interest won't REALLY be in love with HER: Oh noooooooo I GOTTA SEE WHAT HAPPENS