Kusuriyuri had said yes. Kurama was amazed by this, and more than a little shocked, but he'd said yes. Affirmative. Positive (well, not entirely positive, Kusuriyuri still didn't and probably wouldn't ever entirely understand) but yes.
Kurama had the good sense not to skip once he left the divination tower (he'd stayed, for Kusuriyuri's sake as well as his own, making sure his lover knew this wasn't a trade-up or a replacement, after all, Kusuriyuri would always be first) but he did let his youki flare a little in a skyward direction, knowing Kuronue would be flying in agitated circles, waiting for the verdict.
He put on a particularly solemn demeanor while he waited for Kuro to find him. No fun in not teasing him a little, after all.