He is finished by ML. He appeared two times. Both of times, there's ML that helping MC to finish it off. First, when MC just transmigrats and decide to go to school. ML's QA bite bff's QA. Second, bff came to their wedding, make some drama, got angry, and take out his QA, ready to attack, but then quickly subdued.
Random spoiler....What happened at Wedding Ceremony? There are some disruption. The bff, the Phoenix family, and cui yi (mtl). Bff just something they do to distract the guards. When the guards take care of bff, there are some explosions in the house. It turned out there are enemies. Cui yi (from cui family, the one who bring bff to the party because you can't come in without invitation) cooperate with other empires. But then this situation quickly solved and become ML controlled. The Phoenix family didn't do anything major, yet. The spoiled daughter just said something, getting angry, and that's it. They will also cooperate with other empire. She told the someone that in their family, they have superior guide (MC), that can make you more powerful if you bed him. But it is at the latter time.
100+ chapter. I forgot the exact chapter sorry. No, he doesn't. They eventually have children. But it's tube child. A boy. Little ML with his cold and stoic expressions. But worry not, he actually a cute and sweet guy. MC likes to kiss him, and he also likes the kiss of dad.
This is interstellar background. Normal pregnancy is rare. Except orc and mermaid.