"Do you know what you're asking for?" Sephiroth hisses out as he rocks into Zechs again. He's pretty sure Zechs does, but...this could be a sizeable time commitment, so he's giving the man a chance to reconsider. Which isn't to say he stops or even slows right now, however. Even if Zechs does reconsider, Sephiroth has no intention of stopping just yet. He can get one or two more rounds of satisfaction here at the very least, he feels, before he might conceivably want to rein himself in. But if Zechs wants him to keep going until he's completely spent...well, who knows how long that will be. Who knows what state Zechs will be in by then...though Sephiroth rather expects that, considering the request the other man made, being reduced to such a state is likely the entire point.