I think Keith might end up with Akris. It took me rereading it to notice. Akris needs a marriage partner who doesn’t care about their abilities being unable to be handed down to their offspring. When Keith spoke to that sage lady who raised him (I forgot her name), she mentioned that his skills won’t ever be able to be handed down to his own offspring. So, looking at it from that perspective, they’re a match made in heaven.
They cut the rest of the chapter. The raw is longer and has the full scene.
It’s on manwhaclan the full chapter
https://manhwaclan.com/manga/lucia/chapter-134/
Second lead syndrome is real here