He was terrible with hiding emotions. His eyes gave away exactly what he was feeling. He actually smirked a little. It was so much easier in the Muggle world, even if it wasn't. Did Sirius know that? He didn't say anything aloud about it, figuring the other wizard would scoff at the notion. Instead, he let out a breath and rose to his feet.
He didn't want to leave. But, he was scared of revealing his secret. "Thank you for trusting me. And it's not that. I am definitely attracted to you. I'm not ashamed to admit it. And perhaps, in another world, I'd say let's keep going and...it would be fun. But, I can't."