While her sister and her husband were away on a trip, Yasuko was left in charge of her three nephews. She had Ke'ai all three of them since they were little, and treated them just as she always did. Of course, they all slept together in a row. However, Yasuko woke up in the middle of the night and was surprised by a big change. All three brothers had grown into "big dicks." Though she thought of them as nephews, Yasuko was sexually frustrated and secretly licked one by one, comparing the taste. Then, she straddled the one she chose and writhed in pleasure, but the whole thing was being seen by Ippei...