Things that I need to happen while Cas is possessing Dean:
1. After Dean gets over the initial shock of being possessed by an angel, he absolutely abuses the angelic powers to do whatever he wants. Free pie anytime? He's going to eat 40 years worth of pie to make up for lost time after hell years. Sam is so done.
"Dean, for fuck's sake, you can't toy with an angel."
To which Cas tells Dean it's fine. It's okay. Ask and you will be given. Cas has trouble trying to hide from Dean that providing for him makes him proud and happy because he IS totally doing what humans call "courtship" so he does his best to impress his human by showing him angelic perks.
2. Dean flaunting Cas' wings and power whenever he and Sam are hunting. Well, Sam hunts. Dean and Cas SMITE. Dean loves feeling the power and terrifying monsters and demons for it. Dean smiting Alastair with Cas guiding his hand is cathartic. Cas would be blushing from all the praises if he could. And this basically means that in all episodes since 4.01 there will be Cas with Dean. Heaven who? Cas ditched them so he won't be doing heavenly business as excuse to be away.
3. Dean loves Cas' wings and feathers but is still scared of flying. Cas convinces him to trust him and they fly around the world (on a date) because Cas wants to show Dean everything and then he tells Dean that his soul is more beautiful than all of those creations. This is probably Cas trying to convince Dean what he means by loving Dean.
4. This is more of an afterthought but now Cas literally lives up Dean's ass lmao. If cock warming is Cas remaining inside Dean after sex, then Cas remaining inside Dean after putting his body back together is angel warming.
5. Dean asking to see Cas' true form and Cas shyly showing him because he didn't want to at first because Dean might get scared. But Dean has a tentacle kink (and that's canon) so seeing Castiel's many grace tentacles just makes Dean scared and horny. Which lets Cas feel horny for the first time because they share a body. Therefore, there's a feedback loop.
