They are happy, most of the time.. Tilly still doesn't like being fucked, but when she's not, she's playing, having fun, being mean to her sisters, or playing games, etc. They're toys, yes, but they're people too. The ironic part, they're closer than any siblings would be. Who else do you know, that can be as comfortable with each other as they are? No fear, no anxiety, no secrets or animosity. With no limitations, there's nothing stopping them, from anything really. And as mean as they can be to each other, that's actually a good thing, in the end they still love each other, but it also shows, they're siblings, they're close enough to actually fuck with each other, in more ways then one.. *he chuckles* sorry.. Point is... they're as close as you can get...