Well, after the end of Disc 1 ahem (code spoiler), and definitely when you hit the crater where we start to explore the truth of Cloud's past. The Lifestream scene was also well done.

All the Cloud/Aeris scenes are impure. Go on the date with Aeris again, and actually listen to what she says. (SPOILER)She ain't kidding that he reminds her of Zack. That's all she talks about when they're in the Round Square. If there was no Disc 2, yes I originally thought that scene was extremely beautiful, but the sad reality is all Aeris loved about Cloud, or at least all that seemed sexually important to her was Zack, and any man who could help her recall those days. Cloud is perfect! as exhibited in Disc 2. What kind of love is a love where one pretends he's someone else?