Kazuki positioned his fully erect, throbbing cock right before Rossweisse's eyes.
'So this is Kazuki-san's... It's incredible, so huge... Is this really going to fit inside my pussy?'
Staring at its imposing form, Rossweisse gulped audibly. Without a word, Kazuki gave his shaft a small shake. A drop of sticky pre-cum, stringing from the tip as the meat swayed heavily, landed on Rossweisse's lips. Connected by the transparent thread, Rossweisse's tongue stretched forward as if drawn by instinct and touched Kazuki's cock.
'Nnn... So this is the taste of a cock... Bitter and salty, a strange taste I've never experienced before... But it's strange. I don't dislike it at all.'
Her tongue lapped and slithered all across the glans, slurping up the leaking pre-cum with an audible gulp. Judging that Rossweisse was now thoroughly melted, Kazuki shifted between her legs and stripped off her soaked, useless panties entirely.
"I'm putting it in."
After Rossweisse answered with a small nod, Kazuki took aim and pierced straight through her.
"Nnn! Ah, nnn! Nnaaaaaaahh!!"
With a wet, squelching sound, his massive cock buried itself deep into Rossweisse's pussy. Her entrance was tight, but as he pressed deeper, the hot, soft walls of her pussy wrapped gently around him, and her inner folds began to pump and milk his shaft.
Eventually, he felt a firm tap against a wall—Kazuki had reached the deepest part of Rossweisse.
"It's all the way in, Rossweisse. Ahh... your pussy feels fucking amazing."
"Haa, haa... R-Really...? I'm glad... For me, too... it hurt less than I expected... I-it feels good... Nnmu!"
Kissing the shyly smiling Rossweisse, Kazuki began to move his hips—slowly at first.
"Haah, ahn, ahn, yaahn! Why...? It's my first time, so why...? Why does it feel this—aahn! So good!?"
"If it feels good, isn't that a good thing? We've probably just got really compatible bodies. See!"
"Aaahn, yes! Your huge cock, Kazuki-san, it's reaching all the way inside... afuun! My pussy's going crazy!!"
Startled that Rossweisse had suddenly started unleashing a torrent of dirty talk, Kazuki nonetheless quickened his thrusts, sealed her lips with his, tangled their tongues, and thoroughly groped and kneaded her tits. Before long, noticing a change in Rossweisse, Kazuki smirked to himself.
"Rossweisse, have you noticed?"
"Hweh? What?"
Oblivious to the changes in her own body, Rossweisse didn't realize. And those nipples of hers—now massively, proudly erect—Kazuki pinched and tugged them upward.
"Hyiiiin!! Eh? No way!? They never got hard no matter how much I touched them before!"
Hardly able to believe that those same nipples had once been inverted, Kazuki rolled the now massively erect nubs between his fingers and milked them.
"Maybe you just weren't getting enough stimulation? Look, as it stands, your nipples are…"
"Ahhyiin! Hyiin! Yaahn, when you rub them like that—aahn! I feel it! I'm feeling it!!"
"See! They're incredibly sensitive!!"
Having been hidden away all this time, her nipples responded with overwhelming sensitivity to these first-time sensations, and Rossweisse writhed in the throes of a pleasure she had never known.
Sucking hard on her right nipple while his fingers teased and tugged her left, Kazuki varied the rhythm of his thrusts—slow and deep, fast and hard—pressing and stretching Rossweisse's pussy from within.
Cumming lightly again and again from the barrage of new sensations, Rossweisse's sweet moans filled the air.
Those countless small waves overlapped and merged, calling forth an even greater wave—and before long, a massive, towering tsunami came crashing down upon Rossweisse.
"I can't take anymore! It's coming! The biggest one is cumming!!"
"That's it, cum! Just let yourself feel it and cum!!"
Her deepest depths pounded relentlessly, Rossweisse's vaginal walls clenched and convulsed, squeezing Kazuki's cock impossibly tight.
Spurt!! Spuurt! Splossh!! Splurrt!!
"Aa-Aa-AaAaAaAaAaAAAHHH—!!"
Kazuki shot his load deep inside her pussy, and Rossweisse climaxed, cumming harder than ever before.
Hot semen flooded into her womb. In that sensation, Rossweisse felt something more than just pleasure—she felt her very soul and Kazuki's soul binding together, deep and inextricable.
'So this... is the Valkyrie's Contract... I can feel it. Our souls... mine and Kazuki-san's... are bound together now... Fufu. It's embarrassing... but I'm so happy.'
Lovingly, Rossweisse stroked her belly, her cheeks softening into a blissful smile.
"Looks like the contract worked?"
Sensing it too, Kazuki asked.
"Yes. The contract is sealed... My Einherjar..."
Overcome with emotion, Rossweisse clung tightly to Kazuki. Gently stroking her back, Kazuki smiled tenderly—and gave a small, deliberate thrust with his still-buried cock.
"Ahn! W-Wait... um, Kazuki-san?"
To Rossweisse's timid, questioning glance, Kazuki offered a bright smile.
"What's the matter? The main event's just getting started."
"Eh? U-Um, wait just…"
"Now that you've formed a contract with me, I'm gonna make sure you see it through to the fullest, Rossweisse."
"Hauuun! S-Such...! Ahn, please, let me rest a little... Aaaaahnn!!"
And thus, Kazuki and Rossweisse plunged straight into round two.
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