When you get to the playground in Sector 6, tell Aeris that you'll "Take her home.
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Sign up for free! A little later too, when she tells you that you left your childhood friend, answer "How can you say that? However, I've just been told Sephiroth has gone to the temple of ancients and I should head there too - so I know I'm close to the point of everything changing. Dating Yuffie is harder to achieve than the previous two dates. Whenever asked about your feelings towards Tifa and Aeris, always express feelings for Tifa for example, when Aeris asks you if Tifa is your girlfriend, select the answer "Yeah, that's right". Do this three times.