I must say that I really enjoyed the ending to both Sora's arc, and this series in general.
It was interesting to see Haru go through the motions after he got caught having sex with Sora, and also interesting that Sora seemed unaffected by it. I'm wondering if she was just trying to mask her emotions, or if she legitimately did not care what others thought of her and her relationship with Haru, (I'm guessing the latter, and, if so, kudos to Sora).
I also thought that the lake scene was very powerful. I would have found it to be a somewhat fitting end if the two would have drowned together, but I'm glad that it didn't end in tragedy. I'm just wondering how Sora had the strength to get Haru out of the water by yourself. I hate to say it, but maybe it was the "power of love."
Overall, I was glad to see the couple survive, and I'm sure that they will stay strong wherever they end up. I was also glad to see that Motoka got a proper ending as well.
As for this series, I really enjoyed Yosuga No Sora, and it's definitely one of my favorite VN adaptations to date.