MDYD-470 - Seductive step-sister's explicit temptation

It's a neatly put-together, standard film, so as a Kosaka fan, I'm satisfied. There aren't any particularly extreme scenes, but it has a consistent level of eroticism. Often, when there's a violation scene, some annoying, talkative actor shows up acting like he's the main character, but thankfully, this film doesn't have that. That said, if the stepbrother wants to be a writer, he should be more proactive about experiencing sex. A guy who's that timid and reserved at his age should just go become a civil servant.