Sephiroth notes the messy hand in his hair, but for the moment takes no notice of it. He's fastidious by nature, and it will bother him later, but it's not his most pressing concern at the moment. Besides...there's something he likes about that gesture from Zechs. Clinging to him, holding him where he is rather than letting him pull away in the least. It's not even simply appealing in a sexual or possessive sense; there's something flattering about it that charms Sephiroth on a more personal level. They barely know each other, but there's almost something affectionate in the desire to keep him close.

Sephiroth notices he's not nearly satisfied yet just as quickly as Zechs does, if not faster. At the question, he tilts his head slightly, thoughtful. "I don't know," he says, in complete honesty. But, noting that note of awe - perhaps hopefulness? - in Zechs' voice, a bit of a smirk creeps onto his lips, and into his voice. "But it seems I'm not done with you yet."

And with that, he starts moving again. Zechs may or may not be ready himself yet; Sephiroth is aware of this, but isn't overly concerned about it. If whatever he drank is affecting him this strongly...well, by the time Zechs is ready to come again, Sephiroth is likely to still be going.