Usotsuki Mille Feuille

Akane Kinuta, an office lady who lies about getting married to keep her job station and otaku hobbies safe. She gets caught by her hot, perfect gentleman boss Kuroki Tsuneyasu... who orders her to do a fake wedding!! They practice having sex to keep their marriage lies from being found out, but Akane's naive body is at the mercy of sexual pleasure...

(Source: Medibang/Media Do International)