A perverted sex story of the Minaho Ariga family. The Minaho Ariga family held a small party, and invited a couple of close friends to eat. This party was quite fun and they ate and drank a little too much and got drunk, causing  them to mistakenly think they were husband and wife and just fucked each other to the fullest. Thinking they were mistaken, they fucked each other even harder and called each other to know each other. How did this fascinating sex story unfold next?