"We are a fake couple. We're not in a real relationship."
We're not a real couple, so meeting your mother isn't necessary. It's totally unneeded!
A ball of rage inexplicably formed in his heart at the seriousness on her face.
"You seem to have forgotten why I made a contract with you." He peered at her unhappily.
"Ugh… I didn't. Isn't it just to be your shield?" she inquired back, blinking in confusion.
"Hur. You do remember that you're a shield." He mirthlessly laughed at her.
"… Ugh!" She realized with a start that she had made a mistake.
She indeed had to meet this man's mother!
As his shield, what was her purpose? It was, of course, to let his parents know that he was in a committed relationship, so he did not need to go on blind dates anymore.
Hence, she must go and meet the man's mother. Not only was she unable to reject the meeting, she even had to see his mother with all her mind and energy.