I got 3P+ list.
http://www.mangago.me/home/mangalist/369/
* http://www.mangago.me/read-manga/friends_like_a_lover/
* http://www.mangago.me/read-manga/nureru_karada_yamakami_riyu/
* http://www.mangago.me/read-manga/hot_triangle/
* http://www.mangago.me/read-manga/himitsu_no_kemonotachi/
* http://www.mangago.me/read-manga/glow_vampire/
* http://www.mangago.me/read-manga/knock_3_times/
* http://www.mangago.me/read-manga/maid_in_prince/an/maid-in-prince-chapter-2.html
* http://www.mangago.me/read-manga/tsumibito_no_kiss/uu/tsumibito_no_kiss-chapter-3/
* http://www.mangago.me/read-manga/1_5_darling/
* http://www.mangago.me/read-manga/youkubari_wa_dame_na_no/
* http://www.mangago.me/read-manga/sadistic_boy/
* http://www.mangago.me/read-manga/hoshi_no_yakata/
* http://www.mangago.me/read-manga/choco_strawberry_vanilla/
* http://www.mangago.me/read-manga/bachi_bachi_kijima_hyougo/ (this one has 2 ch. with 3P the first one and don't remember the other.. sorry)
* http://www.mangago.me/read-manga/chotto_ya_sotto_ja_tomaranai/
* http://www.mangago.me/read-manga/futari_no_maharaja/
* http://www.mangago.me/read-manga/junk_boys/
coul you ecomend me some good yaoi with w threesome like this one : http://www.mangago.me/read-manga/you_re_my_loveprize_in_viewfinder/mh/v06/c035.3/26/
or some yaoi with a seme like asami hot, sadist and is manaly a real man.