How difficult could raising a little sister be? What if she was a sex vampire, a succubus?
Since my friend Limnophile isn't allowed to write anything with characters under 18 in sexual situations, I have re-written the first chapter of his original story 'My Sister Shana', with permission. This much dirtier version has younger characters and more 'sleaze'.
Link to original story - https://wolfpub.org/contributors/show_item.php?cid=10424&i=660