Work Text:
Astarion lay on the bedroll in Karlach’s tent, catching his breath. It was late, and they were away from prying eyes in the camp. They had just been intimate - Astarion’s cunt was dripping from being stuffed with Karlach’s cum. They had done their best to be quiet as Karlach manhandled Astarion and fucked him hard.
Usually they fucked more than once when they had the chance, so Astarion raised an eyebrow when Karlach stood up after a single round.
Karlach walked over to grab something in their tent. “Hey Fangs, I found something I want to try out with you. Tav and I found it earlier today.” Karlach turns around with it - it’s a sleek, rune-inscribed magical device that is gently pulsing with magic. It looked like a pair of panties, with only the front part covered and the back held by a strong string.
Astarion smirks at first, feeling flattered and intrigued. “Oh my, and what exactly is that, darling?”
Karlach walked closer to him and kneeled on the bedroll beside him as she explained, “It’s a chastity device that locks you in and prevents you from cumming while intensifying your arousal. But it does more than that, Fangs! It makes a link between us, so I can feel everything you feel.”
Astarion’s eyes widen, his grin falters and his body stiffens slightly. He wasn’t used to feeling…vulnerable. He asked, “You’ll feel…everything that I feel?”
Karlach nods, saying, “Every pulse, every ache, every ounce of need. I want to know how it feels…when I make you happy.”
Astarion looks at the device, then takes it from her. He held it in his hand, considering the implications of such an intimate action - yes, they shared tadpoles, but this was different. Karlach waited patiently as Astarion considered the device. Finally, he looks back into her fiery eyes and says, “Yes. I want this. I want to do this with you.”
A grin spreads across Karlach’s face. She asks him, “Are we going to use our same safeword system?” Astarion nods - the color system works best for them.
Karlach scoots closer as Astarion moves up to kneeling position. Karlach slowly slots herself in front of him and loosens the device, sliding it over his hips and covering his dripping cunt. Once she tightens it, it makes a clicking sound and a warm hum of magic begins. The belt rumbles lowly and begins amplifying Astarion’s pleasure.
Astarion gasps - and so does Karlach. The first pulse of his arousal hits her body like a sharp, electric heartbeat. It spreads through her mind and entire body like it does his. Once she drinks in the sensation, she opens her eyes and grins widely, while Astarion swallows hard, realizing that Karlach indeed felt what he was feeling.
Karlach’s voice was breathy as she asked, “Oh gods, is…is that what I make you feel?” Astarion blushes as she describes it, “Feels like a heartbeat, no…like a fire wrapped up in fine silk. It’s wonderful.” Her eyes meet his as she asks, “Color?”
Astarion speaks softly and firmly, “Green.” He cautiously reaches his hands out towards her, indicating that he wanted more. Karlach pulls him into her arms and brushes her warm lips along the cool flesh of his neck. Astarion shudders - and she feels it both on the tips of her fingers from touching him and deep in her core.
Astarion is clutching her arms, dragging his fingernails down her arms as he pants, “I-It’s so intense, darling. I-I’m…we’ve only just started.”
Karlach continued her slow, torturously sweet touches across Astarion's skin - the pads of her fingers ran down his shoulders, waist, and around his nipples. She whispered praise in his ear before biting down on the flesh of his shoulder - all of this without once touching the belt. Every sensation that she gives him is reflected back onto her - Karlach is turned on by Astarion’s desires; his arousal feeds hers, which only amplifies his more in turn.
Astarion panted, his legs parting as he began to move his hips, wanting friction that he couldn’t achieve. When he begs, it’s breathy and needy, “Please…darling, you don’t know how much I-”
Karlach gently cuts him off, saying, “Oh, I do, Fangs. I feel everything - right now, I own your pleasure.”
Astarion gasps, biting his lip and trying to grind against Karlach helplessly, “You’re…going to break me.”
Karlach chuckled, “That’s the game, love.”
Internally, Karlach was afraid that she was pushing too hard - she was afraid of having this much control over his lovers’ pleasure. She wasn’t used to being able to control things like this. However, it was clear that Astarion wanted it - not because of weakness, but out of trust for her. Knowing that he trusted her so much caused Karlach to get hard again, but her focus was on him - she wanted to make Astarion beg more.
She asked Astarion simply, “Can I fuck your pretty little asshole?”
Astarion’s eyes widened - they had anal only once in a while, but Astarion was melting inside at the thought of being denied orgasm while being fucked. He spoke, “Y-Yes…get inside of me.” Karlach groaned at the arousal that Astarion was feeling. She didn't hesitate, grabbing their bottle of oil. Every stretch of his hole that she made with his fingers caused another wave of arousal to flow into both of them.
She then pulled Astarion over her lap and positioned his hips over her cock. “Color, soldier?”
Astarion breathed heavily, feeling extremely aroused, “Green! Fuck, please…! Don’t stop!”
Karlach couldn’t deny him what he wanted, so she quickly lowered him down onto her engorged cock, both of them groaning in ecstasy as she filled his other hole. Neither of them hesitated to move - Astarion bounced on her cock as Karlach moved him up and down. The runes on the belt hummed, making them feel like they wouldn’t last. Their thighs trembled, and both of them were extremely close.
Astarion begged, “Darling, please! Let me…let me cum!”
Karlach teased him, “But you’re so beautiful like this.”
Tears pricked at the corners of his eyes, and his voice cracked, “Karlach…please…! I need to cum…it-it feels too good!”
Karlach thrusted a few more times before pressing her fingers against the rune in a certain spot. The belt depowered and Karlach thrust inside of Astarion several more times before they both came. Cum soaked the inside of the chastity belt, both from Astarion and from their earlier round.
Astarion pulled Karlach into a kiss, asking, “Can we…possibly do this again? Maybe I can wear it while we adventure?”
Karlach laughed, kissing him again and saying, “You’re so needy, Fangs. But I love that about you. I love feeling how you feel. I want to do this often - your pleasure is amazing, I can’t wait to feel it again.”