So Skittles and New Pig have been together in the hutch about 12 hours. Skittles spends a lot of his time upstairs (New Pig hasn't braved the ramp yet) but seems to willingly come downstairs from time to time. New Pig is still exhibiting dominant behaviour which makes me nervous to watch, but it has definitely calmed down, and the pigs are able to share a pile of veg or hay. I assume this is a good sign?
I still feel a bit nervous about it all and will be keeping a careful watch on them this evening and tomorrow.
The photo was about half an hour ago, eating hay together.