beta
ok i've seen people sharing clearly wrong spoilers... so this is what actually happened in the raws (and yes i DID buy and read the manga in cmoa thank you very much!)
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yuuma (omega) purposefully got pregnant by timing his heat while ren is visiting his place. the reason he did it is because he knew yuuya and ren are in love with each other, but yuuya would never say anything because he's an alpha and has always put yuuma's needs above his first, and has already decided one-sidedly that ren is better suited with yuuma. so he got pregnant and left after having the baby because he knew yuuya would never let ren suffer alone and step up to help, thus allowing yuuya to be together with ren as a family. he did acknowledge it was fucked up and has regrets about it, but well, he did it with a good intention i guess. and he succeeded because ren was moved by their conversation so he finally confessed to yuuya and told him he would never let him go <3