I don't know if you want just some hot scenes or sth like BDSM or sth else, so just a few recs from me:
http://www.mangago.me/read-manga/bamford_koushakuke_no_shitsuji/
http://www.mangago.me/read-manga/ore_no_ushiro_ni_tatsu_na/
http://www.mangago.me/read-manga/under_grand_hotel/
http://www.mangago.me/read-manga/houkago_no_love_call/
http://www.mangago.me/read-manga/kareshi_glamorous/
http://www.mangago.me/read-manga/kuroneko_kareshi_no_asobikata/
http://www.mangago.me/read-manga/beast_feast/
http://www.mangago.me/read-manga/ikenai_otoko/
http://www.mangago.me/read-manga/crimson_spell/
I'm looking for straight up HARD Yaoi. Romance.
Suggestions ?