royal fiance by asuma risai
the game series of takagi ryou (oujisama game, ousama game, _____game (forgot the title)) one of these have the thing you are looking for
amai jouken by hyuuga seiryou
will tell some more i'm gonna look for the title first XD
believe it or not, i collect horrible guys hahaha. they had the most intense stories more than usual i can't help it.
also, i have jotted down helpful notes on each and indicated if it's the seme or the uke to make it easy
http://www.mangago.me/home/mangalist/71183/?filter=&page=1
Try "Sasayaku no wa Sono Yubi" by Yamakami Riyu. Pure definition of sadistic cruel seme BUT has a more or less happy ending. Also check here - http://www.mangago.me/home/mangalist/57857/ majority of the seme here are cruel. I have mentioned which ones in my reviews.
Was wondering if anyone know of yaoi manga with cruel seme but the storyline has a happy ending. Thanks in advance!