https://www.cmoa.jp/title/300739/

Shizuku, who has never been in a relationship before, is arranged to marry Takaharu, a handsome and elite business analyst. However, their life together is nothing like a newlywed couple. Shizuku is concerned about her husband's cool and impassive personality, but one day, when another man makes a pass at her, Takaharu embraces her possessively! He unexpectedly kisses her, telling her sweetly "I don't want you to look at any another man," and it sets Shizuku heart fluttering…? (Source: Berry's Bunko, translated)

Iroha, a new office lady at a trading company, has never been in love, but she is about to enter into an arranged marriage. However, she still dreamed of having her first experience with someone she loves. So she boldly confesses her love to Kashiwagi, the most popular man at the company! They decide on a "limited-time lover's contract" and start slowly. Kashiwagi leads the nervous Iroha, who is nervous and stiff at first, gently through a first date. Although they are only suppose to be temporary lovers, Iroha can't stop herself from falling for him...! (Source: Berry's Bunko, translated)