Chiharu Mitsuha lives together with her boyfriend's (masochist) nipples, which are constantly scratched by his little devilish girlfriend who loves them so much that they keep tingling.
[Agony! Nail scratching and nipple torture] The trigger was that I had a sensitive reaction to the nipple prank. Every day since then, he has been playing with the tip with his fingernails and making a devilish look on his face, saying things like ``It's cute'' and ``It feels good.'' Every time you rub it, your body reacts twitchingly, your brain goes numb, and your precum overflows with pleasure. No matter where you are in the house, you will be irritated by the nipple fingernails, and you will be driven to the urge to ejaculate, and you will have sex to the limit of your patience. My nipples and dick were caressed from the time I woke up until I went to sleep, and I couldn't stop tingling, so I was already a masochist...