Bokura no Mitsudomoe Sensou

Quote from azazelfaust9

The Threesome Yaoi List on MyAnimeList has a list of most threesomes in yaoi manga, even ones that are oneshots that are just a chapter or two in between other stories, and gives a brief spoiler-free description.
http://myanimelist.net/forum/?topicid=132385
Hope this helps. 😁

Helps whom? The original poster, who started this thread five years ago, or demonlord272 who necro'ed this thread instead instead of starting her own, and has already had the question answered.

The little descriptions on the site you link to are nice, but most of the activity on that list was four years ago. You can get current results by searching this database, genre search for 'Yaoi' + category search for "threesome" or "group intercourse"
Also in my opinion that list is suspect, since it includes Haru wo Daite Ita, which does not have a threesome.

It has an attempt at switching partners that doesn't pan out.

And someone has bumped this as I was typing, so oh well, hooray for necroposting.

I honestly do not find anything wrong with necroposting as long as it's related to the main question. I mean like, it's so much easier to go through one thread with all the answers rather than going through a lot of them with repetitive short answers.
But again this thread was bumped by something that doesn't really help answering the main question, so I see where your point's coming from.

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K n e e l .... This is the difference between your and my eye-level.
Rai from Noblesse

Futari No Musuko Ni Nerawarete Imasu

"A sword is useless in the hands of a coward."