Apparently this is from a 2001 PC game called Custom Slaves - Chapter of Sayoko. Information found at: http://blog.livedoor.jp/gais_chlo/archives/39032263.html
Original title: 睦月小夜子(カスタム隷奴～小夜子の章～)
Source: https://www.youtube.com/watch?v=3BmYN9iufNM
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