She has the day shift; he guards the night. One pegasus, one thestral, just trying to make things work. They've known each other since childhood, so meeting the family shouldn't be quite such a big deal. But then the family tree got involved...
The newly reformed changelings have been given a mission by their visionary and benevelont King Thorax: they must snuggle all the ponies in Equestria. Most ponies take to this with gusto. Someponies are more... difficult than others.