The pleading face emoji shows big watery eyes and a small frown. It is used to mean 'please', to look cute when asking for something, or to express being moved or touched by something sweet. 'Look at this puppy' followed by a pleading face means 'I'm melting'. Among Gen Z it has also taken on a romantic, swooning meaning, similar to 'aww, my heart'. There is nothing sexual or harmful in standard use. If your child sends it, they are usually being cute, asking nicely, or saying something is adorable.