muzan wanted them to go get food and when they were in the forest they find you and you were so sweet and innocent to them so they want to spare you

Akaza:"good for you i-we dont eat..uh..you kind of people"trying to make a excuse not to sound like a softie

Douma:walking near you

Kokushibo:"muzan might punish us but thats not a problem..."carrying you bridal style