What's a simile in Section 2, Via?

"But after she died, I held on to that secret and let it cover me like a blanket." Section II, pg. 87

Via will always remember the way Grans took the time to look out for her and cherish her. When Grans told Via that Via was her angel, her favorite, Via let that secret become her security blanket, her reassurance that someone really did care even though her needs were often pushed to the side in her family.