ya know.. now I can't remember if he actually did the ceremony or is just "engaged"... but it looks like she's several months preggers but that maybe he doesn't know(??). I don't want to reread, it's been so long... lol
Yes they got engaged but not married. The engagement happened before the 3rd sage showed up and fought with Sansui's master. After that Sansui was temporarily able to regain his grown body and desires (ch 64) which is when presumably got Brauer pregnant. And yes he doesn't know. He went off right after to the desert kingdom. He is accompanying the lady they serve cause she's getting married to the prince there. So Sansui has been away for a good while.
As for why they didn't married: I think the plan was to make Sansui a swords instructor, give him a noble title, and then have him marry Brauer. I don't remember whether he can or cannot marry Brauer as a commoner (Brauer is a noble lady). But the family he serves was planning to making a noble before he married.
Kinda forgot that this even existed. How tf is it still ongoing?? And did he get married??