My brother's wife, Mio-san, is beautiful and seems like a proper lady. What you'd call a reverse harem type. Up until now, there hasn't been much difference between me and my brother in terms of academics or physical strength, but now there's such a gap... But from the moment I saw Mio-san, none of that mattered anymore. Someone this beautiful and with such a great figure is going to be my sister-in-law. Did she notice my gaze? My sister-in-law started tempting me. Of course, I couldn't refuse, and we ended up having sex with internal ejaculation...
