this one is cute
http://www.mangago.me/read-manga/dounimo_nannai_soushi_souai/
this fits also
http://www.mangago.me/read-manga/hana_to_junketsu/
I absolute recommend this - but its still ongoing but you can 'read' the raws till the end
http://www.mangago.me/read-manga/to_take_an_enemys_heart/
here- not sure about the warm side but they are not complete assholes
http://www.mangago.me/read-manga/yoru_to_asa_no_uta/
http://www.mangago.me/read-manga/risou_no_koibito/
http://www.mangago.me/read-manga/royal_fiance/
http://www.mangago.me/read-manga/hero_heel/
http://www.mangago.me/read-manga/if_you_hate_me_that_much/
caste heaven
pick out the semes in this one. http://www.mangago.me/home/mangalist/43415/
Please recommend some BL mangas in which the seme is an asshole. Preferably one where he has a warm side to him, but anything is fine.
I've already read http://www.mangago.me/read-manga/hina_wa_mitsuiro_no_koi_ni_torawareru/ and http://www.mangago.me/read-manga/hogu_hagyeongsu/
Check them out if you want to!