Yasuko has to take care of her three nephews while her sister and her husband go on a trip. All three of them have loved each other since they were little and have been in contact with each other since they were young.Of course, when we go to sleep, everyone is in the character of the river.However, Yasuko wakes up in the middle of the night and is surprised by a big change.It was because all three brothers had grown into "big cocks".Yasuko, who is frustrated even though she thinks he is her nephew, secretly licks one and two cocks and compares the taste.And she straddled the one she chose, and she was in agony, but she was seen all the time.