Aki-Sora: Yume no Naka is an open continuation of prequel Aki-Sora, the story of brother-sister love. As an exception from other titles of this genre, Sora and Aki are true sibblings - the love forbidden by others. I'd rate Yume no Naka more like softcore hentai. Long sex scenes, weak story.
I had enjoyed the prequel much more to be honest. If only the story was longer, I'd come to like it much more. There's almost nothing more to be shown, honestly. The story didn't really have a chance to expand in these two episodes.
Anyway, if you're fan of this genre, you might like it. If it's wrong or alright, it's up to you to decide.