Tenshi na Kimi no Zurui Kao

Serika has a childhood friend named Sora. Ever since they were little, he was cute and a crybaby, Serika has always protected the angelic Sora. But lately, Serika has started to dislike the fact that everyone thinks Sora is an angel. And Sora's "sly face" that only she knows keeps making her heart flutter!? (Source: Ciao Plus, translated)