"Sure am~!" The story's a lot more convoluted to be sure, but it's probably better sticking to the simpler version - they live together, they get on with each other, ergo friends.

He cleared his throat quietly.

"So… about that rabbit…" …the one in his arms seems relatively unperturbed but the one on the ground sure has gone still. He's not going to tell Alucard not to eat but...