The final "ending" is the same, the studio is probably still writing the script for when the MC reaches the kingdom (Part 2 of the main story), so, for now, they are adding in small parts and developing relationships that are "easier" to introduce, such as Twig's. So, we probably gonna see more from the other Guild girls, before Robin gets where he is going. I read they are planing on adding more threesomes and stuff, wich is allways nice.
Personaly, i suggest you keep some backup saves, and let the girls know you are fucking others, mainly Thea, Chinthya and Gabrial, they are cool with it as long as you keep it honest, as for the others we probably gonna see some options to tell em in the future.