«Hakuto... wake up, Hakuto... it's time,» Yuzu whispers.
«Y-Yuzu... what is it now...?» he mumbles. His voice is rough and annoyed.
Hakuto is still half-asleep, but he immediately senses something strange. A heavy, soft weight presses down on his chest. In an instant, he knows what it is.
He opens his eyes wide as pale moonlight filters into the room, just enough to reveal Yuzu. She's wearing her usual light lace lingerie, more sheer than it should be. She's lying on top of him, chest to chest. A mischievous smile, like a child about to play a prank, lights up her face.
«W-What the hell are you doing...?» Hakuto whispers. He grabs her arms and flips her to his left side.
Yuzu puts a finger to her lips. She gestures for him to stay quiet.
«Don't you remember what we talked about this morning—the plan to help you get more confident with Rika's body? Well, it's time to put it into action!»
«I already told you, there's no way I'm going to touch Rika. Especially not while she's asleep!»
«You're saying you don't want to help your sister control her powers? You're so selfish! If another pervert tries to attack her again, it'll be your fault!»
«You're really guilt-tripping me just because I won't grope my sister while she's asleep? If she wakes up, she'll kill me for sure!»
«Oh, if that's your only problem—that you're afraid she'll wake up and catch you in the act—then you don't need to worry.»
At that moment, Yuzu's eyes glow red. A faint crimson mist spreads over her skin.
«Yuzu... what are you planning to do...?!»
«Shut up and let me handle it!» Yuzu snaps.
Then, she stretches her arm toward Rika. A faint blood-red trail streams from Yuzu's fingertips. It seeps into her sleeping sister's ears, nose, and slightly parted lips.
«There we go!» Yuzu says with a satisfied smile.
«Explain yourself before I hit you!» Hakuto snaps. He keeps his voice low.
«Calm down! I didn't do anything to her! I just used a vampiric spell to put her into a deep sleep. Right now, not even a cannon blast could wake her.»
A soft, feminine moan fills the air a second later. The sound is incredibly sensual. But it doesn't come from Yuzu.
Alarmed, Hakuto quickly turns to Rika. For a moment, he mistakes it for a moan of pain.
She's lying on his right side at the far edge of the bed. But it isn't pain.
Hakuto lifts his torso slightly, and he can clearly see Rika's expression.
Her cheeks are flushed. Her breathing is heavy and ragged, as if she's run a marathon. Her mouth is slightly open, and her tongue peeks out timidly past her lips.
«Yuzu... what did you do to her?!»
«I just told you—I put her into a deep sleep, one where she'll dream her most intense, hidden fantasies. The ones she's too embarrassed to admit even to herself. It's meant to—how should I put it—set the right mood,» she says with a mischievous smile.
«But that... that's a succubus specialty! You said it yourself—her succubus powers are stronger than yours. So how did your magic even work on her?»
«Oh, it's simple. My magic might be weaker than hers, but my mastery of succubus powers is much better. The mind is also more vulnerable during sleep. That made it possible. See? It's your fault for not even trying to help her gain full control over her powers!»
Rika's moans grow sharper and more intense. Her body curls up tighter, knees almost pressing against her chest.
«Oh, Hakuto... Rika's moans of pleasure... aren't they music to your ears?» Yuzu teases. «Since you're not planning to take advantage of the opportunity I created, I'll just do it myself. It'd be a shame to let such a chance go to waste, don't you think?»
«Y-Yuzu... you're really a pervert!»
«No, I'm a succubus,» she replies with an innocent smile.
Then Yuzu rolls over on top of Hakuto again and reaches for Rika's butt. In that position, Yuzu's crotch presses against his.
«...it seems this situation is affecting you more than you're letting on...» Yuzu says with a smirk.
She feels something big and hard pressing against her lower belly.
«Well, obviously...» Hakuto mutters, almost ashamed. «...but that doesn't mean I think this is okay!»
But Yuzu doesn't even listen. She stretches her arm as far as she can. She grabs the waistband of Rika's pajama pants and yanks them down in one swift motion.
Rika's perfectly firm and round butt is revealed. It's covered only by white panties, wedged between her plump cheeks. It's like Yuzu just pulled back the curtain on a work of art.
The sight, combined with Rika's intense, sensual moans, overwhelms Hakuto. Only sheer willpower keeps him from losing control of his hands.
But Yuzu shows no such restraint. She immediately grabs her sister's butt with both hands, her fingers sinking into the soft flesh as she massages and squeezes harder and harder.
Rika's moans grow louder with every motion.
Hakuto gulps, his face flushed with embarrassment—but he still can't take his eyes off Rika's butt.
«Are you absolutely sure you don't want to join in too? Succubus powers lose their effectiveness if used too often on the same person. Next time, Rika might not be so... willing.»
«I-I told you I'm not interested...!»
But Hakuto's voice doesn't sound convincing at all.
I can't! I can't! I can't! Hakuto, resist!
Yuzu's smile grows even more wicked.
He's breaking! He's breaking! she thinks, satisfied.
Then, as if to push him over the edge, Yuzu parts Rika's butt cheeks.
Even in the dim light, the wetness dripping between her thighs is clearly visible to both of them.
He's no expert with girls. But even a beginner like him knows what that wetness means. Rika is extremely—overwhelmingly—aroused.
«See, my dear brother? Looks like our precious Rika is really enjoying her dream. I wonder who the lucky guy is? Maybe it's you. And if that's the case... I'm sure reliving that same dream while awake will finally erase those stupid beliefs about saving her virginity for the love of her life!»
«I-I... I don't...» Hakuto stammers.
«Come on, Hakuto! This is your chance to have sex with Rika! Now or never! Go!»
«Y-Yuzu... stop it...!»
«Guess I'll give you a little push!»
Yuzu's hand leaves Rika's butt and rests on Hakuto's forehead. In a fraction of a second—before he even realizes what's happening—she casts her succubus magic again, this time on him.
As if compelled, Hakuto's hand moves on its own. He grabs Rika's butt and squeezes it hard.
«Oops...» Yuzu giggles as she gets off Hakuto and rolls back to her side of the bed.
Rika's fingers instantly clamp down around Hakuto's wrist. She squeezes so hard he almost feels it snap.
«What the...?» Rika mutters sleepily. She keeps gripping Hakuto's wrist tightly.
Rika looks down between her thighs. Her pants are down. A wet stain marks the sheet beneath her. And Hakuto's hand is still on her butt.
«R-Rika, I can explain!» Hakuto stammers. «It's not what you think! It was Yuzu who—»
He trembles with fear and embarrassment.
Before he can finish the sentence, Rika jumps out of bed. In an instant, large black wings sprout from her back. Her eyes turn blood-red.Her body is wrapped in a purple aura. Her gaze, blazing with murderous rage, locks onto Hakuto and Yuzu.
«I... I...» Rika mutters. She stretches her arm toward them, her hand open. A glowing orb of energy forms in her palm.
«Hakuto, Yuzu... I'll kill you!»