"Kei" is a Japanese term that can refer to multiple meanings in a pornographic context, but most commonly it signifies a young boy or male teenager. In the adult entertainment industry, especially within Japanese productions such as anime and hentai, "kei" might be used to describe a specific category of content featuring characters who are teenagers or boys.
The tag "kei" implies that the video contains scenes with young boys or male teenagers engaging in sexual activities or interactions, which could involve other males or females, depending on the storyline and genre. It is essential to note that these depictions may not accurately represent real-life age groups or relationships due to artistic liberties and fantasy elements often found in adult content.