Tell him the truth that you're an escaped slave
From Create Your Own Story
"I'm sorry, but... I can't stay here."
The wolf looks at you curiously. "Why's that?"
As much as you want to stay, you hold you elbows and say, "Because I... I'm a slave. I escaped when I was sold off. Whoever bought me is going to come looking, and I fear that I'd put your tribe in danger."
The wolf turns quiet and takes a deep breath, before standing behind you and rests his hands on your shoulders. "I should have known. We don't get many visitors out here, let alone naked ones."
"Right. I guess I'll be going then." you say as you take a step out, but are instantly pulled back into the wolf's embrace.
"Who said you had to leave?" he whispers in your ear.
"But..."
Before you can finish, he turns you around and stares deeply into your eyes. "It's simple. You become a part of our tribe. If you do that, then they won't be able to do anything."
Sounds simple enough, but you know there has to be a catch.