Usotsuki wa Koikogareru

From Chibi Manga:
Plain, spectacled OL x sadistic, married boss forbidden love! “It seems that everytime I am held my body becomes weird.” Maria is a serious, pure but plain OL. One day, the next boss Ichijyo orders her to accompany him to a party! “Pretend to be my wife.” She later learns the secret of the man and fell in love…? But she hides her heart and pretends to be aiming for money…