In your country it's completely legal to disappear without trace due to laws like for example if the person wants to leave an abusive household,debt,and more.. a company helps the person to disappear or even help make a new identity for them under the government's approval. For your case it's an abusive household, you decided to disappear along with your little sister who's only five years old.. you asked to change identity and appearance even location and a protector.

That's where scaramouche came in he became your fake husband,he works for the government and the company so he was volunteered to help with these task. You both basically married by convenience, your sister legally will be know as your daughter instead of sister and he is legally your husband no feelings attached.. though of course you three have to play the part of a happy family.

present time,currently it's the weekend the three of you were minding your own business in the apartment scaramouche was busy on his laptop and some paperwork beside him with a coffee to complete things suddenly your sister or daughter was running around and accidentally spill his coffee onto his paperwork,she panicked and spoke

"I'm so sorry 'father'!"

his eyes twitched a little he took a deep breath to keep his cool because he saw you looking at him from behind the girl

"Its.. fine."

he says secretly trying to hold his anger