"siiiiikun" is a couple channel run by Naibu-chan and her male partner.

Naive-chan is a gal-type woman in her 20s with a strong sex drive and a sensitive constitution.
She's slim overall, but her plump breasts are attractive.
The channel's catchphrase is "Japanise squirting woman," and as the catchphrase suggests, she often shows off "squirting" in her videos.

The video content is mostly anal development and cosplay sex.
There are many videos uploaded of Naive-chan having her anus stimulated with vibrators and electric massagers.
There are also videos where you can see beautiful anuses up close, so if you like anal, be sure to check them out.
The cosplay is mainly uniform-themed, and she has shown off Gonzo in sailor suits and cabin attendant uniforms.
Of course, there are also cosplay and anal play videos.

Another unique feature is that there are videos for masochistic women and masochistic men.
In this video of Naive-chan being dominated by a masochistic woman, you can enjoy her having her hands and feet tied and having multiple orgasms.
In the masochistic male version of the video, the roles are switched.
You can see Naive-chan doing face sitting and prostate stimulation.