Children melt away the day

My 2 little girls are amazing and always make bad days better and good days great. Today after a bad day I walked in the door to a girl with her arms hugging each leg screaming daddy. I made it home just in time to put them to bed. 5 minutes after I walked in the door, my day was a thing of the past and everything was great. I'm scared of them growing up and losing the innocents of there word that makes me king.