Opinions on sastiel blood kink but its castiel with the kink not sam? (Like cas seeks out sams blood and sams just.. idk willing ig?)
You know, I think that something that could fit with that is
Like, Sam is having problems with the demon blood
And Cas offers a solution for it, that being Sam drinking his blood, even though Cas is a little weakened right now, to control Sam's addiction
So, it's their thing, Sam drinks Cas' blood at least once a day
Cas quickly shows "worrisome for Sam's comfort" and starts offering them to be in specific positions
Like, Cas sitting on Sam's lap, they laying on the same bed
Then he says that Sam doesn't need to wait the blood to drip and lick it, he could just suck it
Sam accepts it, is so refreshing to see that Cas isn't disgusted by him. Being close to Cas also makes him... Think about stuff
Time passes and, Cas starts getting flustered while they do it. He starts touching Sam, like placing a hand against his chest, caressing his arm. Sam responds by keeping Cas closer, caressing his face, holding his waist
It might get a little NSFW here, sorry
One day, with Cas sitting on Sam's lap, and Sam feels the fabric on his thigh getting wet
Cas feels embarrassed, trying to keep a straight face, asking for Sam to continue his activity
As Cas gets weaker and weaker, he is concentrating his grace on the blood repositioning, and now some body fluids like sweat and, in the case, lubrification, are bound to happen
He says he's sorry, he can't avoid his physical response
That they can change the method into giving Sam the blood indirectly, like in a glass or bowl, but
Sam kisses him. And Cas kisses him back
Now, their usual activity is accompanied by making out sessions, and some more adventurous touches
But there's one detail: actually, drinking Cas' blood isn't the only way of controlling Sam's addiction
He could have suggested to realise a weekly spell to keep Sam's desires down
It would have almost the same effect
But, Cas doesn't think it is essential information
They're doing very well by now
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