That was never possible with this author, if you've seen any of their work but ending short does still suck.At least we didn't get the dreaded "Very Good Friends" ending that so many supposed yuri stories like to do.
Honestly, I'm quite content with this ending. I don't think there's really a good way to make this kind of story work out without either doing a time skip, dragging it out needlessly, or turning one of them into a paedophile.