Koi to Seiyoku

Noah agrees to live in his dream Japanese house for a month on the condition that he communicates with the homeowner, who is a hikikomori (recluse). Noah wonders what kind of person he is, but what appears before him is Kei, a taciturn and expressionless young man who is like a cat who is not used to people. Noah had hoped to get by with minimal interaction, but he finds himself unable to leave Kei alone, as he is in such a dangerous situation that he can't believe he's been living alone. Even when he goes out, he's worried about Kei... When Noah came home late one night and checked on Kei, he heard a seductive voice...!?

(Source: Takeshobo, translated)