Can anybody recommend a yaoi similar to http://www.mangaupdates.com/series.html?id=766 or ** http://www.mangaupdates.com/series.html?id=1594 **, where person A is in love with person B, but person B is in love with a person C, but then person A and B end up together and also person C is a side character not a major part of the story.

Thank you.

Off the top of my head I can think of:
The Box (oneshot)
Chapter 5 of Koi to wana (and its sequel Mankai Darling but it's more on the couple-y side).
Chapters 7 -10 in Doushitemo Furetakunai (but you've probably already read that).

I'm certain I've read a few more that fits this request so I'll have to take a quick look through my bookmarks when I have time and see if I catch anymore. 🙂

Thank you for the recommendations and more would of course be appreciated and yeah I have already read Doushitemo Furetakunai.

Thank You 😀

Kasa no Shita, Futari
Dog Style - they both liked someone else
Don't Cry Baby
Saigo no Door wo Shimero!
Kawaige second couple. there is a continuation: Otonage.

if there is an option between "to do" and "not to do", I will always choose the latter.

"what kind of crazy, twisted conclusion is that...?" - banana bread no puding

Seconding Dog style.
Also Escape (KYUUGOU) is a oneshot, but it fits.

Thank you 😀