creep in
To enter some thing or place slowly and/or stealthily. I may have allowed my personal feelings to creep in when I gave that job to my brother. Luckily, mom didn't hear us last night when we crept in after curfew.
creep in (to something)
to go into something or a place slowly and carefully; to sneak into something or a place. The cat crept into the bedroom. Max planned to creep into the house and take cash and jewelry.