Any yaoi manga where all characters are connected in some way?

http://www.mangago.me/read-manga/ikenai_otoko/

http://www.mangago.me/read-manga/koisuru_intelligence/

http://www.mangago.me/read-manga/pinup_boy/ This universe

I may be lying to you, but I'm pretty sure all the characters in Links are connected:

http://www.mangago.me/read-manga/links/

I may be lying to you, but I'm pretty sure all the characters in Links are connected:

http://www.mangago.me/read-manga/links/

Also, not all of them are connected, but most of them are, Hand Which:

http://www.mangago.me/read-manga/hand_which/mf/v01/c001/

Yeah, all the characters in Links are connected with each other. The audiobook is on YouTube. I highly recommend watching it.

- Same universe:
1. http://www.mangago.me/read-manga/shitsukekata_nijuumaru/
2. http://www.mangago.me/read-manga/otte_otte_koi_o_shite/
3. http://www.mangago.me/read-manga/boku_no_osekkai_darling/
- An obvious one would be the Junjou Romantica and Sekaiichi Hatsukoi series
- The werecat series by Sakyo Aya as well

- http://www.mangago.me/read-manga/acid_town/
- http://www.mangago.me/read-manga/yandere_hitotsu_yane_no_shita/ (the extra at the end, the characters meet at a cafe)
- http://www.mangago.me/read-manga/koakuma_no_sanctuary/ (I think the couples have a meeting together)