This was very nice. I would not want a Ayase sequel (as that would ruin the vanilla), but an alternate "what-if" version for Ayase would be fine with me.
I want a what if version for all girls, and other scenarios that the girls would be fine in, like Kyousuke marries Ayase but Kirino lives with them so threesome end, or Kyousuke marries Kuroneko but since Kuroneko is fine and accepts Kirino's feelings for Kyou would also lead to a threesome end, and a harem end just to complete it all.
Hell anything is better than the cannon anime or novel ending.