Goddamnit, the chapter title got my hopes up - but, I guess, as soon as they get together the manga will end within like five chapters, just because of the premise. I hope that there'd then be a sequel showing their lives as a couple, but the chances of that are low.
Are they identical twins or fraternal? And if they're identical, does that count as incest or is it masturbation? And more importantly, why am I still reading this?