You know who was also in heaven? The boy, because if your childhood friends who happen to be twin sister both love you and decide to stay together with you and bath you in their love, you are obviously in heaven...
Well, judging by their power and how bad and torturous it would be to going out with one sister while the other feels everything they do and goes crazy with longing and lust, choosing both seems the best option as it has the highest chance of working out and they all pretty much knew from the start that this would be the natural way of how things would turn out...
Although this is the last part of the series I still hope we get something like an eight page after story showing how their lifes went on, how they life now together and how the boy knocked both up...
It's nice to see a continuation of this series, but judging by the way this ended, it sounds like there won't be any more...And while that's a bit saddening, it was a great series while it lasted.
And of course, that ending. At least our protagonist has his priorities straight. When asked to choose one over the other, you don't do that...You always just go with them both.