Living with the spoiled sister-in-law

I moved in to live with my brother and sister-in-law Nao Jinguji to make it easier for school and work. Living with both of them, I often had to witness their passionate and intimate moments, despite being right next to them; they still engaged in actions that should be reserved for their private room. As a boy going through puberty, this made me feel an intense desire. My sister-in-law often wore very revealing outfits at home, which heightened my lust even more.