The S-Regimen

When Zipp's pursuit of flight causes her to neglect a cherished foalhood sister ritual, Pipp notices.

Ever since foalhood, Zipp and Pipp have had a ritual: when Pipp comes down with a routine head cold, her sister looks after her, and they spend time together watching soaps or cartoons on the nearest comfy couch.

What happens, then, when Zipp begins to distance herself from her family in the pursuit of flight?