Sunrise was not born to the pack but found his way to it in his adolescence. When it came to the naming ceremony, Seer only saw a sunrise over the savannah in her mind. Perhaps the savannah is where he was from, but he never spoke of his origins. Sunniva, heiress of the throne, took a liking to him and the Seer felt a connection between the two pups.
When Sunniva left the pack and got pregnant just months before the pair bonding ceremony, Sunrise was crushed. He just couldn't understand why Sunniva would do such a thing knowing that the first female pup born from an heir was the only pup eligible to take over the throne. That meant that even if Sunrise went through with the ceremony, his pups would never see the throne.
Once Sunniva's pups weaned, she decided it was time to own up to her mistakes. After an extremely long apology, the two decided to perform the pairbonding ceremony. Though it would be many moons until Sunniva's next heat, Sunrise was excited to have pups he could properly call his (though he was enamored with Stardust and Sky).