Read Sensitive Matter Manga:
Park Min-Joon can’t hold his excitement when he’s with a girl enough to stop her breathing. You somehow managed to avoid the female employees, and the new replacement is a woman?! And with her babyface figure, she’s the only one in the secret room. Minjun gets excited by her harsh breathing, and he’s getting more and more dangerous. Senior, can’t you stand it? Would you like me more.. to help you?