if prompts are still a thing; "your eyes are So pretty"
"Thank you... your eyes. They are also quite pleasing to look at," Castiel replied, barely able to make eye contact with you, which you thought was amusing given the topic at hand.
"Thanks Cas," you spoke softly, that swelling feeling filling your ribcage when something made you really and truly happy. You knew he was probably only passing the compliment back because he didn't know what else to say, but it didn't stop that feeling from filling you up anyway.
"Your smile is also- you're beautiful, did you know? I've seen many forms and many faces over the millennia but yours... all the others do not compare."
You felt a flush crawl over your skin, betraying just how you felt about those little comments of his. And Castiel, usually so oblivious, noticed it right away.
"Oh, I see," his lips twitched into a very subtle smirk. "I did not realise my words had such an effect on you."
"Didn't you?" You asked sceptically, trying to get a hold over your reactions and failing miserably.
"Okay, you got me," Cas' grin widened just a touch, and you felt your heart flutter at the sight. "Maybe I knew a little."