D.O.L.Ls: Designated Operator of Libidinous Logistics - #2 Protect and Serve (Part 3)

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Context: After the situation was under control, Ling Xiaoyu also wanted to join the "party" with the Willians sisters, but they wouldn't let her. When she went to get the only dildo they had there, it was also being used. To make matters worse, when she sought comfort from her master, he was busy. So all that was left for poor Xiaoyu was her fingers and her desire for sex