"You want to announce your engagement to me and Aracelle?" Shana asked seriously.
"Yes," Thirteen answered. "Of course, if you don't want to let the world know about our relationship, I'll respect your decision."
Thirteen only delayed the announcement of his engagement with Shana and Princess Aracelle to the world because he knew the consequences that would follow.
Back then, they had been fighting a war against the Jinns and the Artemians. He knew that many would have reacted harshly to his engagement with Shana had he announced it when they were still at war. He had decided to wait until the battle was over.
Now that the Wanderers and the Jinns had decided to cooperate, there was no longer any need to keep this a secret from the rest of the world.
Also, Thirteen wanted to make a statement.
Shana and Princess Aracelle belonged to him, so everyone should no longer bother them again with marriage proposals.