Woah, man I didn't expect that! It was certainly quite the experience.
It really felt like a desperate person who was pushed to rely on the comforts of their imagination before impulsively acting it out, and while yes, the person has been planning this out religiously, the fact they were pushed to doing such an act and then being flustered over it just shows how underprepared they are and if they truly wanted this or if they were now forced to commit to it.
The talks about murder and of the kidnapper's dark desires chilled me, not only that but the kidnapper continuously and unconsciously teasing the player that they would be let go all while panicking over themselves really was suspenseful, especially with the ending that counts down because the VN (I assume it is, please correct me) just automatically exits by itself at the last second leaves us in this suspense if our MC will be okay and safe or if the kidnapper truly fell apart under their twisted desires.
Amazing work~ Really brought a chill to my spine!