Multicouple stories are actually my fav! Hope you enjoy these
https://www.mangago.zone/read-manga/ichika_bachika/
https://www.mangago.zone/read-manga/tadaima_okaeri/
https://www.mangago.zone/read-manga/19_days/
https://www.mangago.zone/read-manga/prunus_girl/
https://www.mangago.zone/read-manga/blunder_turned_wonder/
I totally recommend "Green Apple Paradise"
Serious joke, it does have like a few dark themes but it's pretty cute over all
This one has multiple couples but all connected in the story:
https://www.mangago.zone/read-manga/ze/
Also, loved the second couple of these stories:
https://www.mangago.zone/read-manga/wolf_in_the_house/
https://www.mangago.zone/read-manga/mr_100_perfect/
https://www.mangago.zone/read-manga/all_about_lust/
If it doesn't have to be colored, here's a manga list
https://www.mangago.zone/home/mangalist/13236/
Can someone recommend me some of yaoi/shounen ai that have side couples (better than the main couple), im sick of only one couple （￣へ￣）