"Noire de Plaisir ~ Pleasure Training of the Fallen Vampire Princess~" it's kinda short, but it's a decent read "Himekishi ga Classmate! ~ Isekai Cheat de Dorei ka Harem~" there's 4 volumes, but it's on hiatus. Honestly, all the smut I pick up seems to get dropped by either the translators or the authors soon after. These are the only two I've read that were worth reading in spite of that, other than the big ones.