Teacupkat

I always end up loosing this manga every time I finish reading it. But it involves two business men who's relationship begins because the blonde seme catches the ils reading something as mistakes him for liking s&m kinky things. He blackmails him a little and by the end they have paired rings.

There is a chapter in which the seme leaves the uke alone tied up and blindfolded as punishment for something and when he gets back the ule catches a cold and he ends up nursing him.

So my friend told me that there is a yaoi manga almost similar to Renai idenshi xx. But in this one the female gene is going extinct and only a few men who carry this gene are allowed to marry the few remaining females. In the manga there is a man who is trying to find a way to solve this problem by unlocking the key to this strange fenominon. However he soons falls in love with his roommate. And that is where she left me it sounded like a fun manga to read. And I was wondering if anyone could tell me the title it would be greatly appreciated. (⊙…⊙ )