It was Gabrielle who gathered the party together. The Mad Hatter's directions allowed her to find Oliver and Carver. She found Cassandra and the Harpy shortly after, finding them on their way towards a distant castle. The March Hare's directions had pointed her there. It wasn't the Queen's castle, but rather the Cheshire's. The Cheshire Cat was almost certainly the source of corruption, and Cassandra had figured heading for her would lead her to catch up with the rest of the party; which is quite demonstrably had.
"It'll have guards," Cassandra said, "Ava could see at least two mamono circling the castle, both powerful looking." "Ava?" Oliver asked, confused. "Me." The Harpy, who'd evidently taken the name Ava, said. "Cassandra's idea." "It just doesn't seem right for you to not have a name." The martial artist said, the Harpy shaking her head, "I'll never quite understand why humans put so much stock into things like names."
"We can argue about cultural differences later," Carver said, "As you were saying about the guards?" Cassandra nodded, "Right, I'm sorry. The first should be easier. She's a Dark Valkyrie, so Gabrielle's magic will be powerful against her. We aren't sure what the second one is, but it didn't look infernal or necrotic, so it'll be a bit harder to handle." She explained.
Gabrielle nodded, "The corruption must be more powerful than I thought to have formed a Dark Valkyrie. They aren't normal mamono, they're one of the few that can only form from an existing mamono being corrupted by dark energy, in this case a Valkyrie. They're turned lustful, and violent. They ignore the orders from the other celestials, and focus on the orders of whatever corrupted them, usually a human black mage powerful demon."
"So she'll have Valkyrie strength and corrupted magic?" Oliver supposed, the fight suddenly sounding much less doable in spite of Gabrielle's white magic. "Yes, but she can't harness the magic, really only channeling it into brief attacks. Can't cast spells." Gabrielle said, "We just need to be careful, but it should be doable if we're all in sync when she arrives."
"And how can we know when she'll alive?" Carver asked. "A burst of white magic should be enough to attract her," Gabrielle said, "So we'll be fine on that front." With this information, the party all got into place, Gabrielle standing with Carver behind her in the middle of the street, Oliver on a nearby roof with his crossbow out for sniping, Cassandra meditating on the ground behind a tree to gather chi, and Ava hiding above.
When Gabrielle let out a burst of magic, she could feel the Dark Valkyrie coming towards it. She flew fast down towards the white mage, slashing with a long purple blade. Carver stepped in front of her, raising his tower shield and bracing himself. The impact let out a loud metallic clank that echoed down the street. There were a second, just a second, of stillness and quiet where the party members could take in the Dark Valkyrie's image.
She was tall, taller than Carver, and just as muscled. Her skin was a deep blue, matching her hair. Her armor was pitch black, covering her legs, arms, and body, and yet still somehow letting her curvy figure be known. Her wings were large and black with color. Her shield was a pink heart shape, and her long, double edged a deep purple against Carver's shield.
Carver pushed forward with his shield, pushing the Dark Valkyrie back. He slashed with his own sword, the mamono blocking with her shield as Gabrielle released another burst of holy magic, the Dark Valkyrie hissing in pain and flying back, recoiling from the magic. She yelped again as a crossbow bolt landed in one of the sections between her armor. She turned, seeing Oliver.
She flew towards the rogue, shield up to block the bolts as she moved towards him. She was intercepted by Ava tackling him from above, knocking her towards the ground. She didn't hit the ground, Cassandra's bo staff connecting with her side and sending her spiraling into the ground. She rolled across the street, Oliver letting out several bolts to pin the Dark Valkyrie's shield to the ground, preventing her from retrieving it as she got up.
She swung at Carver, who blocked with his shield once again and slashed at her legs, knocking her down. She turned from the force of the slash, and he drove his shield into her wings, preventing her from flying off. Gabrielle released a more focused holy magic burst, burning out the Dark Valkyrie's energy, and leaving her open for Gabrielle to cast holy bondage, locking her in place. The battle was over fast in terms of time, and now all that was left was to sate her.
Because the final blow had been a combination attack of Carver and Gabrielle, the two of them would be the ones to sate the Dark Valkyrie. She still struggled against the chains, however weakly, and couldn't break free of them. With a little manipulation of their placement, Gabrielle forced the corrupted mamono's mouth open, with the magic, preventing her from closing it or biting down. She moved forward, opening her robe and thrusting her member into the monster girl's throat.
She moaned at the feeling as she fucked her sexy mouth. Carver began to undress, planning on waiting, but moving forward when Gabrielle pulled out early, evidently wanting them to take turns with her. The Dark Valkyrie gagged as the white mage and heavy knight took turns in her throat, one pumping into her for a few minutes then letting the other. Them to her surprise, both of them ended up inside her throat at once, their cocks choking her as they fucked her together.
Carver moaned, enjoying the extra tightness as her throat constricted around his cock, as well as the feeling of Gabrielle's member sliding in and out against his own. Soon they were both close, both just waiting for the other to blow before they let loose. A few minutes later, both were unloading their first round down the monster girl's throat. It was too much for her to swallow all at once, and began running over her chin. As they pulled out, the last few spurts got onto her face as well.
Gabrielle shifted the chains back over her mouth to close it, preventing her from screaming insults or spitting out the seed still in her mouth as she and Carver lifted her up, both of them still hard, and Gabrielle charged with holy magic to attempt to cure the Dark Valkyrie. Carver was behind her, lined up to her tight asshole, Gabrielle's tip pressing against her pussy lips. On Gabrielle's cue, they both thrust into her at the same moment.
The Dark Valkyrie couldn't scream, but her attempt to was clear even through the chains as she felt both large cocks sink into her body, the force of Carver's penetrating her ass pushing Gabrielle's deeper into her cunt, and both of them stretching her out on either end. The pace was a rapid one, taking no time to get her used to it, wanting only to fuck and finish off the rogue mamono, who could only squirm and groan in silent submissive as she was used like a toy by the party members.
Oliver watched them go, a tent forming in his pants that he told himself out act as motivation to fight that much harder in the battles to come. Cassandra did not face the same problem, sneaking away for a little break time with her Harpy. Oliver muttered under his breath about her luck as he continued to watch his friends plow the corrupted mamono, their fucking having finally synced up to the same rhythm, letting them both hilt themselves inside of her holes hard.
And with how hard they were both going, Oliver wouldn't have been surprised if their rods had been touching in the center of the Dark Valkyrie, who's body was being utterly contorted by the roughness of their fucking. Gabrielle had begun to glow with the holy magic she was pouring into it, only getting stronger each time the mamono came, losing a little more resolve.
Gabrielle had timed her climax to strike right when the Dark Valkyrie's third, and by coincidence Carver's second, hit as well. All three of them exclaimed in pleasure as the Dark Valkyrie was filled up to very near the brim in both holes with seed, Gabrielle's being accompanied by a large dose of holy and healing magic, purging the infernal corruption from her body.
The Dark Valkyrie's response seemed to be another orgasm hitting immediately after the first (technically third) had subsided, her body beginning to glow as it did. It lost the blue color, returning to normal as the black feathers became a radiant white once again. The holy chains melted away as they could no longer sense any dark or demonic magic in their captive. The Dark Valkyrie had been healed.
It took her a few moments to adjust to being back to normal, which was just as well, because after that, Carver and Gabrielle both needed a few minutes to catch their breath. When they were all back to normal, the Valkyrie explained that she'd been sent in to deal with the growing corruption, tasked directly by the Queen of Hearts to find and remove it, only to be filled with corrupted energy before she could even find the source.
"I don't know what the actual source is, but I know you'll find it that way." She said, pointing to a distant castle, "There's a Jabberwok sleeping up there though, so you'll need to be careful as you go." The party members nodded, thanking her for her help. She shook her head, "I should be thanking you all for saving my life," She said with a smile, which turned slightly more playful as she added, "And for the fucking~"