DSOD-076 Whispered by the glasses-wearing sister with huge tits, 'Are you about to cum? That's so noble,' my reason was blown away and I came inside her multiple times in this extreme pervert POV. Sumire Kurokawa

Sumire, an introvert otaku, has a step-brother after her mother remarries, and they end up living together. Sumire can't help but dote on her first step-brother and find him cute. Sumire, a secret nerd who can't control her feelings for her brother-in-law, dotes on him with a unique creepy way of speaking, whispering lewd things. Her love for her brother-in-law, which she cannot refuse, goes out of control and escalates!