love triangle that turns into a throuple relationship

I recently finished reading the series {Hat Trick by Samantha Wayland} and I would like to read something similar - kind of a love triangle that turns into a throuple relationship - generally summarizing, in the series I mentioned: MMC1 and FMC start dating, then MMC1 with the consent and even encouragement of FMC, starts dating MMC2, then due to a complication in the relationship of MMC1 and MMC2, FMC wanting to help solve this complication gets closer to MMC2 and eventually it turns into a throuple relationship. Just like in this series, I want MMC to be the person who starts it all. I would prefer it to be a series, but it can be a standalone book where MMC1 is already separately in a relationship with FMC and separately with MMC2, and it'll focus only on the beginning of the relationship between the three characters. Thank you!