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Castiel is what holds the three of them together.
He swallows hard. His fingers are digging into Uriel’s shoulders. It would cause any human too much pain to continue. Even Castiel, now, would be too fragile to stand the way he tries to grind Uriel’s bones together beneath his grip to survive. Uriel keeps his hands under Castiel’s shaking thighs to prevent him from taking more of Uriel’s cock before he’s ready. Castiel never imagined- He couldn’t have-
“It’s intense,” Anna says against the back of his neck, “but you will survive it, brother.” He remembers her saying the same thing a month ago when she first picked him up off the side of the road, bloody and lost. Anna wore humanity well when she had it. To Castiel, it’s an ill-fitting suit, both too tight around his throat and too large for him to grow into. All sensations are in turn torture and rapture. Too much of a good thing becomes a stomachache or a sore muscle. Anna kisses his shoulder, helping Uriel to hold him still as Castiel adjusts.
“What does it feel like?” Uriel asks. He always does, no matter how much he finds Castiel’s humanity off-putting. He and Castiel were so close as to be able to know each other’s thoughts, once, before Heaven broke them both. Now, he’s left on the outside of this experience where Anna and Castiel share common ground. He would never choose to be human, but he would choose to not be so alone. Castiel releases his shoulder to put a hand against one on his thigh and urge Uriel to let him down an inch or two. He freezes up again as he takes it.
“Full,” Castiel manages, “and- And uncomfortable, it hurts.” Uriel frowns. Castiel sucks in a breath. “But there’s-“ Castiel rises a little, enough to feel the stabbing fullness retreat as Uriel slides out, and the emptiness it leaves behind makes Castiel ache for more. He sinks again, taking Uriel deeper. “There’s so much. It hurts, and I think I like it.”
“You’re not making any sense,” Uriel says. Castiel feels the strangest urge to kiss him. He’s not sure if Uriel even knows how to kiss, if he’d want to. Castiel has a profaned mouth now, one that’s tasted smoke and food and vomit and blood, and Uriel is still an angel, however fallen they are now.
“So you’re not enjoying it at all?” Anna asks Uriel. They rarely touch each other when they can be touching Castiel. Uriel’s vessel doesn’t bear a scar, but sometimes, looking at him, all Castiel can see is his grace rupturing beneath his skin.
Uriel lifts a hand to Castiel’s face. Castiel doesn’t flinch as he touches the curve of a jaw he once beat bloody.
“I didn’t say that.” Uriel is not, has never been, gentle. The way he cups Castiel’s face is firm, but Castiel find more comfort in that than he has in gentle words in a long time. It’s honest. Anna hums, her hand replacing Uriel’s on his thigh to hold him up. Castiel feels stretched open far enough to tear, but he also did when it was only the head of Uriel’s cock pressing into him. Every inch has shown him he can take more, that he can bear the pain of it until it becomes hard pleasure. He squirms to make them lower him further. The heat of Uriel’s thighs is a brand against his own.
“Almost there, Castiel,” Anna says. It has been decades since Castiel acted on her will, but he still responds to her orders without hesitation. He falls the final stretch until he and Uriel are hip to hip and Castiel is shaking again. “Well done, brother.” Anna massages his thigh as Castiel tries to breathe. Uriel is so deep inside him. It feels like he has more claim to Castiel’s vessel than Castiel does. “Imagine this,” Anna says, and at first Castiel thinks she’s talking to him again until he sees Uriel tip his head in response, listening without taking his eyes away from Castiel’s face, “but a thousand times less than what you can feel now. You wouldn’t know the reaction of every cell or the exact temperature of Castiel’s body. You would only know that you’re inside him where he’s hot and tight and wet” — Castiel clenches around Uriel. It makes the burning stretch more overwhelming, and helplessly, he does it again and again. — “and you’d need to fuck him.”
“I do want to fuck him,” Uriel argues, annoyed. Castiel can feel Anna’s smile when she presses her face between his shoulderblades.
“Need feels different,” she says. “Need is what he’s feeling.” Castiel is rocking against Uriel’s cock unconsciously. Every moment that passes makes it feel better. His body is adjusting to Uriel inside him, a vessel settling around the expansive mass of the angel who fills it. Castiel’s vessel once referred to him as a comet, but Uriel is more, a planet, unbothered by Castiel’s little movements.
Uriel lifts Castiel up and then slides him down his cock again. He does it as easily as waving his hand. Castiel is nothing between the two of them, a pale shadow of his angelic self, and they could break him if they wanted to. He would deserve wrath, much more than he deserves this. Uriel shuts his eyes. “I prefer this. Need would distract me from him.”
Anna laughs. “It’s plenty distracting.” She reaches down between Castiel’s legs. He writhes when her fingers hone in on his sensitive clit. Anna works him expertly, stroking him each time Uriel fills him again. She presses herself to Castiel’s back, as burning hot as their brother. Castiel can feel her soft chest, and his clit twitches against her fingers. Before they ever suggested doing this, Castiel’s vessel would get wet at just the thought of Uriel or Anna naked. He’s had hazy dreams filled with Uriel’s strong arms holding him down or Anna pressing his face between her breasts or both of them, taking whatever they want.
Uriel makes a noise as Castiel tenses around him, deep and satisfied. Anna won’t stop stroking him, though he tries to warn her that he feels like something is about to shatter inside him with each touch. All that escapes his lips are gasps, driven out by Uriel’s thrusts. There’s too much. It’s going to destroy him.
Castiel loses himself in pleasure. He feels out of control, and he’s only released from the feeling when Uriel lets him drop into his lap again and Anna stops touching his clitoris. Castiel goes limp, falling forward into Uriel.
If he shuts his eyes, he can pretend he’s an angel again and that the pleasure Uriel has given him is his grace reaching into Castiel’s own.
He’s completely relaxed when Anna begins to touch him. He hadn’t even considered that he could use his other hole for this before Anna showed him. She’s fingered him every day in preparation for this, pushing his limits further and further. He lets her in without a fuss, one lubed finger, two, three, spreading him hole. Uriel grunts when she pushes them in deep.
“I can feel you through him,” Uriel says.
“He’s about to get a lot tighter.” Castiel trembles. His words are lost to him, but if he still had them, he thinks all he’d be able to do is beg for Anna to put her cock inside him. He hears the crinkle of the other condom wrapper tearing, and Anna’s sigh as she rolls it down her length. That’s less about safety and more about fairness. Uriel doesn’t get to feel Castiel without a barrier, and neither does she. She teases the head of her cock against Castiel’s ass, pushing him open slowly. The burning, painful stretch he felt around Uriel returns, more intense as his ass takes something bigger than any of Anna’s fingers.
Uriel swallows, the first time he’s been caught off-guard. Every shift forward presses Anna’s cock against his through Castiel, separated only by a thin wall of flesh. Castiel whimpers. There isn’t room, there can’t be room, he’s already so- But Anna pushes deeper, makes room, takes equal claim of Castiel as Uriel has.
“Fuck,” she breathes out against Castiel’s shoulder.
“Different?” Uriel asks. Anna nods.
Castiel has never felt as good as he does here, broken open.
Anna and Uriel have to work together to fuck him, and it’s clumsy and hesitant. They skirt around each other’s touch, and trade Castiel’s weight between themselves. They find a rhythm and fall out of it just as quickly, one of them slipping out of Castiel until he whines at them to fill him back up. Anna gives him kisses along his back and his neck and his jaw, but Uriel holds him tighter, his forehead bumping Castiel’s every few thrusts. They tumble together further and further into senseless pleasure. Castiel can’t tell where he ends and they begin, and he wishes he would never have to.
Uriel finds his clit this time. He mimics Anna’s touch, less practiced but Castiel doesn’t need much more than his attention to feel that same rush flooding him.
They almost come together. Uriel is a few thrusts behind Castiel, and Anna a few more, but it’s enough. Castiel takes them as deep as he can, feeling them twitch inside him.
Uriel pulls out first. He makes a mess trying to get his condom off and Anna snickers. “Here,” she says, her voice full of sleepy-warmth as she leans into Castiel. She ties the condom up. Her hands get dirty, and briefly, her fingers brush Uriel’s. Castiel smiles despite himself. He slumps into Uriel, trusting his brother to take his weight, and Uriel does. When Anna pulls out, Castiel is left with a deep soreness and a sense of loss he can’t name.
It’s assuaged, somewhat, by Uriel drawing patterns into his back with his fingernails and Anna pressing one more kiss against his cheek.