Keiyaku Cohabitation

Hayasaka, a competent yet people-pleasing salesman, decides to let Kumagai, a part-time local convenience store worker, live with him in order to protect a cat he rescued. Although reluctant at first, Hayasaka gradually begins to feel comfortable having Kumagai stay with him and opens up about vulnerabilities he's never shown others. One day, Kumagai, with a sweet look on his face, tells Hayasaka how cute he is which makes Hayasaka catch feelings...?!

(Source: MangaPlaza)

Note: Includes two extra chapters.