Bros, in case you are going Shanghai, you might want to try this Mistress. Her nick in collarme.com is Goddessofslavery and her English name is "shengtianhu", a direct translation from her Chinese name.
Do note that I have not tried her personally but her pics certainly look good. According to her website, she has 5 years of experience and she is now 25 years old.
Her website is
http://216.245.215.93/3/index.aspx
Her blog is
http://www.queenslave.cn/