Originally Posted by
Restingvoice
So a Dick Kori fan was questioning the relationship status on Twitter, but later, they have been convinced that Dick and Kori's sex was just a birthday gift during the time where Dick hasn't begun a relationship with Barbara because the writers said so but I haven't found where they said so.
So yeah. Apparently it was a birthday gift and they haven't committed further than that. I guess Kori wanted more or thinking it will open a possibility, since at that time Dick hasn't committed to anyone, but once the phone call happened, even with Dick trying convince her that it was nothing, and it was nothing at that time, she can guess what will happen and decided to closed it off.
Well, that's simpler, I'll just place it somewhere during the montage in #83. (I forgot that in #80 Dick spent the day trying to find Heartless)