Cenobia hadn't seen Ayashe since he grew up, but he spotted her in the forest today. He sees her as a sort of big sister figure, since she was the first deer to spend time with him in the forest. He wears red flowers in his antlers because Ayashe used to do the same, and would give him some to wear, too.
Despite looking so different as a young adult, Aya recognized Cenobia right away, and they hopped around and danced with another deer for a while before she had to leave.