Preston: My first companion. He always seemed to disappear during firefights and returned once wearing power armor. I kept him around for about ten levels until I sent him off to wait at the Castle. After he and I liberated the Castle, he returned to Sanctuary took off his armor in one of the houses and lounged around in his underwear with only a pipe pistol to defend himself. I have no idea what happened to his rifle and clothes.

Cait: After expressing her undying love for me, we went to the Colonial Taphouse in Diamond city. Cait in her sequin dress and stylish glasses and myself in a Tuxedo. After a few Bourbons and beers we witnessed a barfight, called one uppity lady a [censored] and left that snooty establishment to run the bases and have a nightcap in Home Base.

Bethesda, you have done well.

I walked into a ghoul den when cait said...what sounded like "Alright, who farted"

Piper and I were exploring vault 95 when we came across the overseer's room with the circle of chairs. Piper said "Oh look... enough left for musical chairs"

When clearing out Fort Strong for the BoS, Curie commented on how dirty the place was and to bad she didn't have a duster. Oddly enough she was standing next to one so I directed her to pick it up. All my lovable Curie needs now is a sixy French maid outfit.

Cait and Curie have some funny verbal exchanges when swapping them as followers.

Yep Preston went back to Sanctuary during the Mirelurk Queen fight. I had to go looking for him in order to complete the quest.