Sirius understood the first part mostly, but he got lost towards the end. Maybe his mind was too cluttered to properly comprehend everything, but he didn't look any less confused when Remus turned away.
The confusion Remus spoke of was something they had in common, though he was not willing to admit it. He was not sure how to feel about the feeling more for him bit either. It made him feel both absolutely thrilled and absolutely terrified all at once so he decided not to address either of those issues. Sighing, he rubbed his hand down his face and looked at Remus. He wanted to punch him and snog him at the same time. "You're bloody well impossible." he snapped angrily at Remus. "I hate you. You're driving me crazy. You don't listen to me. You're an idiot." he barked out, looking rather angry as he reached to pull Remus in and crash their lips together.