Can't find story forgot authors name......father remarries has two stepdaughters,son get youngest pregnant has daughter father moves ex back home....girl go to college..comes home engaged,.boy marrys other stepsister.....
Can't find story forgot authors name......father remarries has two stepdaughters,son get youngest pregnant has daughter father moves ex back home....girl go to college..comes home engaged,.boy marrys other stepsister.....
It's a long time since I read it but could falling-for-my-step-sisters by bfrap be what you're looking for?