One

Cas has been dating Aaron for six years now, and he loves it. Mostly. Sometimes Aaron loses his temper, but it's okay. He still loves Cas. Cas just has to make sure he doesn't upset Aaron. But one day Cas meets Dean. Dean is funny and beautiful and confident, and Cas likes him a lot. They start to hang out more and more, and Cas starts to realize that relationships don't have to be the way his is. But he can't leave Aaron, they love each other. Right?