Kissing [30 Variants] (Pixiv Fanbox)

Two trainees tied up together have been told to keep kissing for the duration of the session. Any second not spent making out increases the total training time by one minute. Sounds easy enough right? Well.. maybe not so much if you’re tied up and being violated while having to focus on maintaining tongue contact with your training partner. If tongue-to-tongue contact has been broken for more than 30 seconds total, the trainees will be blindfolded, gagged, and severely punished for their disobedience~