Light bondage and humiliation play, as well as the mc being an acousticophile (someone who is sexually aroused by an auditory stimulus- in this case, his partner's voice).
Keisuke's friend, Shinoda, is a stocking fetishist.
Soo Hwa, the story's mc, is an acousticophile.
Seme has a virgin fetish.
Chapter 7 features an uke who is a masochist with piercing fetish.
Uke who has a piercing fetish, and his seme, who develops a piercing fetish after meeting the uke.
Chapter 5: Iwasa Saguma has a leather fetish, and constantly imagines his coworker, Matsunaga, in leather.
Shinomiya has a muscle fetish, with rugby player Kuroda's muscular body in his sights.
Chapter 6 tells the story of Takigawa Nozomu, who was suddenly kissed by Yamagata Ryou, who confessed to having a teeth fetish.
Amemiya is a college freshman with an amazingly round and sensitive booty. Unfortunately for him, this fantastic butt of his attracts pervs who fondle him on trains. While being molested on a train, he is saved by fellow college student, Arashiro, who seems to develop a butt fetish after saving him.
I Am Your Pavlov Dog