Ah. Hearing that hits Sephiroth strongly enough that his hips twitch slightly upwards - not enough to make it obvious what they're doing, but a shift people would certainly be able to note if they were watching them. "So you've thought about me in particular doing this to you," he breathes. His initial assumption was that it was a generic fantasy, that Genesis had merely pictured doing this with someone, but to think he'd dreamed of this scenario with Sephiroth specifically...

He likes that far too much.