Personally I do think the interactions work well either way, maybe the mom goes a bit too fast, but nothing too agressive yet, more onto the side of being drunk and being with conflicted feelings in the following days.
Even if I do think incest works fine, the same applies without it. Their relationship with the MC is believable. I even think their relationship makes more sense than Darci's one, even if I like the character.
I always prefered games with incest, but if it isn't your cup of tea, it works completly fine without it as well.