Please help me find a yaoi

I was reading in incognito mode, and my tab closed. I had read about 2-3 chapters of it.

Description :
The seme is watching porn in the train and hasn't plugged in the earphones properly. The uke (who's a virgin) heard his favourite porn star's voice and got hard.
Seme finds this interesting, and they both end up having sex. The seme leaves his card behind.
2 weeks later :
The seme shows up at uke's office. They end up making a bet. The uke has to hold off and not cum (he has a vibrator on speed 3 up his ass). He comes when seme is removing the vibrator. So according to the bet seme can ask for one thing. Seme says "why don't you become mine?" Or something like that.

Then they're going out, I guess. Further along, uke catches cold, seme nurses him. Seme is in the habit of taking care of his step-brother and cooks pancakes, etc. So uke grows feeling.

Seme's mom is a bitch. And uke tries to comfort him. Gives him a BJ.

That's where I was when I stopped reading. Please help me find it if it clicks with anyone!

(The porn actress's name was from "C". Chihiro I think. Seme's name is same as the porn actress.)