A clattering sound came from just outside the door. After a moment, as if resigning herself, the door opened, and Irina entered, her face bright red and fidgeting nervously.
"Kazu-nii...!"
When Irina stepped into the room, she found Kazuki standing there without a single thread of clothing.
His body was not overly bulky with muscle, but rather an ideally balanced, so-called lean-muscular physique. Her eyes were stolen, above all else, by his male member, rigidly erect as if piercing the heavens, and her face grew hotter and hotter.
Panic seized her mind, both from that sight and the fact that her peeping had been discovered, and words failed her. Without warning, Kazuki suddenly embraced her.
"Ka-Kazu-nii!?"
"This is your punishment for peeping. Stay still."
Kazuki's hands encircled her waist and back, crushing the braless breasts beneath her nightwear and reshaping them.
And on top of that—
'W-What is this hard thing pressing against my stomach...? T-This is definitely—!?'
The sensation of Kazuki's cock pressing against her through the thin fabric of her nightwear struck Irina with shock.
'Eeeeeh!? Th-This is a man's...? Wait, so something like this is going to go inside my vagina? What!? No, no, no, no! That'll split me apart!?'
While such thoughts raced through her mind, Kazuki's hands began to caress her body, and her body reacted to each and every touch.
"Ah, oh, Kazu-nii!?"
The hand that had been stroking her back slid unnoticed to her sides, gently tickling as if tracing the curve of her waist, while the hand on her hip roamed to her rear, kneading the flesh of her buttocks as if confirming its shape.
Irina's body, already flushed from watching the three of them making love, welcomed the caresses regardless of her will, and hot nectar overflowed from between her thighs.
"Haa, ahn, n-no, Kazu-nii... If you do any more than this, I'll... fuun, fall!"
"Is falling such a bad thing?"
"It is bad! Fuun... I'm Michael-sama's Ace, after all. If I... aahn... were to fall, it would cause... trouble for Michael-sama. So... nn, aaah, please, stop..."
Irina pleaded with Kazuki. Yet his hands did not halt. They slipped inside her nightwear, stroking her bare skin directly. The hand that had entered from her side found her breasts, while the hand that had slipped in from her waist moved from her rear to her crotch, teasing her womanhood.
'Aah, this is bad! The stimulation's too strong... If I come like this, I'll really fall—!'
Amid her panic, Kazuki whispered sweetly into her ear.
"It's fine. You've been masturbating and cumming while peeping until now, haven't you? Then this time is just the same."
"Th-That's—!"
Truly, the whisper of a Devil. It might have been so, but that had been when she touched herself. She had never been made to come by a man before, and her body quivered with fear of the unknown. She wanted to believe she was not trembling from pleasure.
But—
"Fuu, u, nnnnn! Aah, no more... I can't take it anymoooooore!!"
A jolt as if electricity raced through her body. Pores all over her opened at a stimulation the likes of which she had never felt, and a faint sweat beaded on her skin.
"Nnhaa, aaan... I said... stop..."
Relieved that she had not fallen, Irina slumped against Kazuki. As if comforting her, he stroked her head and gently pressed a kiss to it.
"Now you know that coming like this doesn't make you fall. This is just a theory, but perhaps reincarnated angels are harder to make fall compared to pure angels."
"That's..."
What Kazuki said held some sense. Reincarnated angels, after all, had only just come into being through interaction with the Underworld under the Kuoh Treaty.
Verification was needed to see what precisely set them apart from pure angels, and it was certainly possible that the human parts of her were putting the brakes on falling.
"In short, I think you won't fall as long as you don't lose your purity. ...By the way, Irina, are you a virgin?"
"Of course I am! As if I'd ever do anything with someone other than Kazu-nii—... Ah!"
The moment she realized the meaning of her own words, Irina's face blazed crimson. W-Wasn't this practically a confession!? She stole a glance at Kazuki and saw him wearing a wry smile.
"Honestly... you've always been careless like that, haven't you? But that cute side of you, Irina—I've always loved it."
"Kazu-nii..."
Still wearing that wry smile, Kazuki clearly said he loved her and held her tight. A warmth spread through Irina's chest, and, overcome with joy, she threw her arms around him.
"Irina, I have a harem of eight girlfriends, starting with Rias. Are you still okay with that?"
"Yeah. I think I can get along with everyone. So, please... make me your bride too, Kazu-nii."
"Irina, I've definitely received your feelings. I love you."
"I love you so much, too, Kazu-nii!"
Their gazes met, and they softly pressed their lips together…
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