Note 029 [Diving into Red Ocean?] Blowjob doesn't make any difference.
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To start with, what I'm going to speak out is about economic and marketing stuff.

If you are interested in such a field, please feel free to check this out.

Related contents: 1. [For beginners] How to do blowjob) 2. The video version of this episode: [Note 033] [Diving into Red Ocean?] Blowjob doesn't make any difference)