A small, tiny part of Bel's mind continued to scream at him in warming, but the rest of it was far too enamored with the fact that Harp asked how it worked. Bel had learned all about contracts a long, long time ago, but this was the first time he was ever actually even attempting one. He had only ever seen them as a distraction or a waste of time, who wanted to dote on some fool wanting to loose their soul when you could just wait for them to send people after you and take theirs? He supposed that was the error in his 'ways', possibly why he was so feared. Because everyone was a target, not just the trash that wanted something more than their own soul. He did not like trash, but Harp was not trash, now was he? No. He was merely an angel without his wings.

When he thought about it like that though, they really had sent him to the slaughter it seemed. Without his wings, he was mostly powerless against Bel, even humans. How truly cruel heaven was, he mused mentally to himself before sucking in a sharp breath, slowly exhaling against Harp's neck before whispering his words again. "Well... There are many different ways it can be done, Harp. It is mostly in personal taste, though. Some ancient words are spoken, some form of blood exchange, then something to cement the contract." He stops for a moment, his nostrils suddenly flaring as he moves his head in a bit more to lightly nuzzle against the angel. It felt familiar to be this close to another without slaughtering them, but at the same time, such a distant and odd feeling. Bel was not sure... He loosens his grip upon Harp, not fully releasing him but giving him the option to move away from Bel if he so wished. 

Why he was giving the angel such an option was anyone's guess. Bel himself did not know if he wanted to grip the angel tighter in a strangle, to bury his face back into Harp's neck, or if he wanted to shove him away and hope he took a tumble down the stairs. Maybe he had been among the humans for far too long, watched how they acted and treated one another. Not everyone liked to be so close, some people even detested it. Though Harp had not really shown much resistance, the appearance of having some control might help make him a bit less reluctant to everything? Urgh, Bel honestly had no idea at this point! 

"Seeing as I rarely never do such things, how about I let you choose what we do? Something as simple as a kiss, or maybe I could put my mark somewhere on you." Bel murmurs softly. "Keep in mind though, there -must- be at least a minor exchange with blood or some form of fluid somewhere in the mix."