Neko, Koi ni Kogareru

Shouta, a sly and persistent wicked cat type, barges into the life of Shirou, a sharp-tongued, cold-blooded four-eyes. The two end up living together, but Shirou, overwhelmed by Shouta’s full-on affection, tries to push him away. Unfortunately, that only twists Shouta’s feelings in an unexpected—and complicated—direction...!?

(Source: Shinshokan, translated)

Note: Includes one extra chapter.