I really appreciate Season 11, Sam. Like I think this is great character development on his part and I just love that he is being so open and honest with Dean, and he is such a forgiving soul that really S11 Sam is tops. I am just so happy.
After the episode tonight and reading some other people’s theories I’ve decided that this couldn’t have been an opening to out Dean as bisexual and show he’s in love with Cas.
In 11x13, they talk about the ‘genie’ morphing into whatever is your darkest desire, emphasis on darkest. So, for the girl, it was Dan because it was a wrong or 'dark’ love affair they were having and for Dan the same thing. For Melissa, it was Dan, not because it was a dark love, but the desire to be loved that led her to dark things.
For Dean, he saw Amara because she is literally the /darkness/. He has the darkest, mischievous, wrong “desire” that a person can have - because it’s against his own will.
The writers could not have portrayed Castiel as his darkest desire because what Dean feels for Cas is pure good, pure pining, pure Love, and that is not what the genie was supposed to portray.
Therefore, there is still hope! And I don’t think the writers are purposefully trying to kill us. Yay!