Futsuu to Fuhen no Hi

Kongou Daiya is a struggling manga artist. One day, he receives a request from Ethan, an editor who is half-British and half-Hong Kongese, to write a BL manga. Daiya accepts the commission enthusiastically after knowing that his BL brought Ethan to Japan. Still, he is troubled by his lack of experience in romance and has trouble creating a story. When he asks Ethan for advice, he suddenly pushes Daiya down and proposes to have sex with him. The oversized penis and the rich technique make his body hot and make him lust for more. Daiya's feelings for Ethan grow and grow, even though he knows it's just a job...

(Source: Mooi Comics, translated)

Note: Includes 1 extra chapter.