Kirai na Aitsu no Homedokoro

In order to hide the fact that they actually dislike each other, they end up living together while showering each other with compliments!

Suie, the daughter of a greengrocer, and Jun, a veterinarian, have known each other since childhood but have never gotten along with each other. When they find out that their parents are considering an arranged marriage for them, they lie and say that they are “already dating” in order to hold off the arranged marriage. But that is just the beginning of a fake romantic relationship that will leave them blushing with embarrassment!

(Source: eBookJapan, translated)