Yaoi Mangas with a Group of Friends

http://www.mangago.zone/read-manga/kibun_wa_joujou/

http://www.mangago.zone/read-manga/chinko_no_tsubuyaki/

This manga isn't a romance manga. It's more like a bunch of smutty oneshots lol but in ch. 2 there is a group of friends and they go to a beach to pick up girls but failed cause of this handsome guy that the girls kept flocking to. Then he invited them to a party which turned out to be an orgy lol Don't worry everyone gets attention lol I guess it's a happy ending lol sorry if this isn't what you were looking for but if you are interested http://www.mangago.zone/read-manga/paripi_party_people/

i'm actually weak against those manga volumes where friends eventually had their own BL relationships, especially when each pairs were featured per oneshot. i like them so much i even slaved myself to create a detailed record of them that i can easiliy access LOL.
sharing to you my treasure http://www.mangago.zone/people/tag/49344/multiple+couples/
also, this is one of my fave friends who each got their own bfs featured in their own chapter
http://www.mangago.zone/read-manga/body_talk_paradox/
http://www.mangago.zone/read-manga/iberiko_buta_to_koi_to_tsubaki/

Caste heaven
http://www.mangago.zone/read-manga/geu_kkeute_issneun_geos/
http://www.mangago.zone/read-manga/nirameba_koi/
http://www.mangago.zone/read-manga/elektel_delusion/
http://www.mangago.zone/read-manga/rutta_to_kodama/
http://www.mangago.zone/read-manga/never_understand/
http://www.mangago.zone/read-manga/rouge_katsura_komachi/
http://www.mangago.zone/read-manga/kare_no_tokubetsu_na_kare/

this manga has alot of sequel and spin off
http://www.mangago.zone/read-manga/i_want_to_be_naughty/