I would really like to read a story where Castiel dies/is sent back to heaven or any other place from where he cannot return, but Dean stays loyal to him and refuses to have sex with anyone else while he's gone, even though he knows that Cas will probably never come back. Whether or not Cas actually returns to Dean at the end is irrelevant.  I just want to see Dean stay loyal to Cas even though he doesn't expect to see him ever again. Also, I don't want stories where Dean is physically incapable of having sex with anyone else, just those where he voluntarily chooses not to.

Thanks for your help in advance! :)