re: Fiction; underage, sibling incest, non-con, orientation play(?), impending force fem
The feminization starts slowly, switching up the nighttime undies with girl prints once they're due for a restock. Once the fussing from that dies off, then more of the wardrobe can be switched over with whatever gets 'borrowed' that week from a friend's little sister.As big bro is responsible for dressing them for the day, they can get away with making them wear it; even if at first it's just at home, a quick wardrobe change before the duo have to go out for the day.
Though with panties being a tad harder to 'borrow,' lil bro is demoted to girly pull-ups during the day; easier to pass off under the weekly diaper budget given by the parents.
Once the wardrobe is switched and mostly normalized, the mannerisms and internal gender can start to be worked on. Starting with not correcting strangers that see lil 'sis' as a girl, then introducing 'her' as one once that wall is broken down.
Only once lil bro is fully broken in as lil sis does big bro start the lewd stuff in earnest; giving her tailhole massages during changes, using an old pacifier as a makeshift butt plug, the occasional addition of cum to some meals when he gets too pent up…