Looking for

https://www.mangago.zone/read-manga/gochisousama_virgin_cherry/
I think this kind of matches number 3 you can check it out if you want.

1. Can you be more specific? 2 tops and 1 bottom and not a love triangle?

2. Rare. Practically non-existence. I don't know why it's not a common trope. But I think I know one or two.
https://www.mangago.zone/read-manga/cumsqueezed_by_two_naughty_guys/
https://www.mangago.zone/read-manga/unlock_a_nerd_boy_s_double_life/

3. There are so many. Here is the list.
https://www.mangago.zone/home/mangalist/97503/

4. If you like Red Mansion then you probably gonna like this too.
https://www.mangago.zone/read-manga/warehouse/

5. There are some on my mind. Let me search for them.

1. It's my time to shiiiiiine! I have whole lists for poly endings (this one is BL):
https://www.mangago.zone/home/mangalist/2486827/
Basically all of them have a bottom main character with top male leads, apart from a few (mostly throuples with one seke male lead that tops the mc but bottoms for the other male lead, or with a seke main character that tops one and bottoms for the other --> see this one for throuples where they all love each other: https://www.mangago.zone/home/mangalist/2688301/).
2. The only poly I found with an actual seme main character was this https://www.mangago.zone/read-manga/twink_tops_office_harem_rape_king_edition_cupid_scans/, but as you can see from the title it absolutely sucked lmao

Rape king edition is crazy and also thank you!! I’ll check them out.

1. Sorry sorry, when I say 2 tops and 1 bottom, I mean two tops that are interested in the same bottom. They are also not jealous of sharing the same bottom, so a poly ending. But if they are jealous at times, it’s okay.

2. Yeah, I wish this was more common as two tops and one bottom trope. Thank you for the recc, I’ll check!

I’ve actually read Warehouse years ago! I loved it, which is why I came to enjoy Red Mansion hehe. I’m a sucker for dark and psychological stories, even better when the MCs are just as fucked up.

Thank you!! Just finished reading them and I love the switch MC, just didn’t like the other two ugh .

https://www.mangago.zone/read-manga/there_s_no_way_this_is_fate_newlyweds_arc/

Then I have perfect things on my mind for you. If you haven't read it already.
https://www.mangago.zone/read-manga/there_s_no_way_this_is_fate_newlyweds_arc/
It is its sequel
https://www.mangago.zone/read-manga/there_s_no_way_this_is_fate/
The sequel's extra gonna blow your mind. Lol

Also, I was thinking of recommending you some fluffy and cute Yaoi but looks like you are more into fucked up and dark stuff. So what should I recommend you? Or both?