we should fund an international "incest is wincest" movement, toward global sexual happiness.
Wars would end instantly, and birth rate would plunge, since a lot of males would be... redundant. But we're 6 billions so... Hey, maybe incest taboo is explaining this large number in the first place !
This was great, best I have read in a while (maybe second, after only Yuri Terrorism). I'll be waiting for the sequel with the other pair of sisters being a little bit too curious about what they saw, I'm not a fan of BDSM tho, so I won't third Throbelisk's idea.