Sad that it was an open ending, but not suprised. Glad to finally see the end even if there was potential for so much more. Better to end soon rather than a sudden axe or drag on too long. (looking at you Yamada-kun and the 7 Witches) Thanks to the team for finishing this. I remember reading this and getting to chapter 10 or 12 and then the old team dropped it and I thought I'd never see it finished. So once again, thank you.
This is one of the stories that I could legit see being a real harem end. Easier to protect him if they work together. Also if the wolf girls really do have a fated mate thing and Usami is hers I don't think Ayame is the type who would deny her that. She would probably insist that she is the wife and wolf girl is the mistress/pet. Owl girl will probably just do whatever she wants regardless and knows the best community so better to let her have some fun and be invested in being your ally. Also Ayame does seem to trust her a fair bit even if she gets annoyed. Also she seems open to "playing" with wolfgirl so she could help her "de-stress".
With all that I think they could be a pretty functional harem, which is more than I can say about most harem stories. They would have a decent balance and good strength if they worked together. Just need a really big bed and extra pillows for wolfgirl to huff.