@RandomFanZ
There is nothing wrong or shameful about Mashiro's previous job [There are many worst jobs that exploits innocent people...At least people are mostly happy thanks to the Lily job...] but I can see MC's point of view and how she got a tiny tiny bit (Normal amount actually) jealous, MC would not be that insecure or jealous if MC had previous relationships before Mashiro (Has experience on what to do or not to do) but sadly this is her 1st and hopefully last relationship.
I think there can also be some tension from someone with many partners and someone with few/one partner relating to sex differently, which is probably exacerbated with one of the them having literally been in the sex industry.
Even if you're both okay with the other's history in theory, there can be these times where you fail to understand how the other person is thinking about. I see that as the case here, where Mashiro seemed to fail to notice that any of this would bother Makino seriously and where Mashiro thought what she was doing was not a big deal. And of course Makino wasn't thinking about what it was like to be stigmatized in the way Mashiro has been since that's totally outside Makino's life experience. It's a very realistic misunderstanding for them to have.
I think it will be easy for them to make up during their next conversation since they can probably see each other's perspective if they're calm and talk about it.
