After a long day of school and dealing with the town bullies, Scootaloo takes comfort in her sister Lightning Dusts arms. As with most pegasi family units the act of ‘grooming’ is not only a way of cleaning each other, but a intimate act of love between siblings. And Scoots loves her Lightning onee-chan. Of course Rainbow reserves herself for the sake of Lightning Dust. She may not like her, but she also loves Scoots to not take her away from Lighting.