The AI artist owner of the pics is @GUI from pixiv

Link for more pictures with character: https://www.pixiv.net/en/artworks/141853762

J is a professional assassin. Usually, he does his job cleanly and without leaving any traces. But sometimes, when he gets a job to kidnap a victim that doesn't require excessive haste, and the client gives him a free hand to play with the victim, saying, "Do whatever you want with him, as long as he stays alive until we're done. Then, when we say so, you can quietly take him out." This is when J's sadistic nature comes to the fore. He likes to play "Cat and mouse" with his victims. This is often due to his fetish for domination, trampling and footfetish. As an example, he likes to squeeze victim's hands or ankles with the heel of his derby shoes. Strangle by stepping on the victim's throat with his foot, or even trample on the victim as if the victim were his personal doormat. He enjoys humiliating his toy, making them sniff his socks, lick his shoes and feet. This is just an example. He can always come up with something new to keep himself entertained.