Kamaitaku Naru Senaka

After being cheated on by his partner and breaking off the relationship, Sakura searches for men night after night in order to satiate his thirst for body warmth. One day, an unknown man gets in the way of his chance of having sex and to his surprise, that unknown man is Hasegawa, an employee in the same company he works at. Sakura forbids him to talk about the other night, and Hasegawa proposes that if he feels lonely they should then live together.

(Source: Ichijinsha, translated)

Note: Includes one extra chapter.