This is set at the end of KHII while Sora and Riku are standed and sitting on the shore...

Riku: Sora, you realize that it will just be you and me for the rest of our lives, right?
Sora: What do you mean? We will get out of here...*long pause* Somehow...
Riku: Get real! Look around you! I do not see any way out.
Sora: *looks around* Good point...

*time passes*

Riku: So you know, we are at that age where we want to...you know...
Sora: Geez Riku, what are you talking about?
Riku: *exasperated sigh* What I mean is, we are standed here to the end of time and we will die virgins...unless...
Sora: Unless?
Riku: *sighs and shakes head* You are hopeless...*looks to Sora and smirks*
Sora: Riku, why are you looking at me like that?
Riku: Shh...*leans towards Sora*
Sora: *blushes*

*scene blacks out to some time later*