«Sorry for the wait! Now I have the perfect outfit to give you your first cooking lesson!»
Hakuto nearly has a heart attack at the sight of little Yuzu.
After nearly ten minutes, she appears wearing a white kitchen apron. That wouldn't be a problem for Hakuto… except that underneath it, she's wearing absolutely nothing—not even underwear! And to make things worse, the tiny apron barely covers anything in the front—most of Yuzu's enormous boobs spill out from the sides of the skimpy garment, reaching just below her private area—and the back is completely exposed.
«W-What kind of outfit is that…?!»
«It's to make sure you stay focused on the lesson and don't get distracted unnecessarily,» Yuzu answers with complete naturalness, wearing such an innocent face that it gives the exact opposite impression.
~Keep me focused on the lesson? I've got the feeling it'll do the exact opposite…~
«How do I look? Don't I look like a real cook?»
Then Yuzu twirls around, flaunting her far-from-modest outfit—the sight of her small, firm, completely bare butt, along with the noticeable lift of the apron's inner hem during the spin, nearly gives Hakuto a nosebleed.
«You look like anything but a cook…» Hakuto murmurs, looking away.
«You're so mean… That's no way to treat your little sister!» Yuzu glares at him with a comically angry expression. «Anyway, today we're making a dish so simple even a three-year-old could cook it: Omurice with ketchup and mayonnaise on top!»
Yuzu immediately gets to work preparing homemade mayonnaise, while Hakuto is given the task of chopping onions—they cook side by side at the large kitchen counter.
Against all odds, the lesson exceeds Hakuto's wildest expectations—especially considering how it started. Or at least, at first…
«Come on, Hakuto! At this pace, we'll be eating omurice for breakfast instead of dinner!»
«I-It's not my fault…!»
Tears stream from Hakuto's eyes—more than he's ever shed in his entire sixteen years of life. It's his first time cutting onions and, although he knew they made people cry, he didn't expect the effect to be so intense and immediate—his vision is completely blurred by the tears.
Yuzu lets out a theatrical sigh. «Let me show you how to cut onions!»
And then… —BOING!
Yuzu's huge boobs press against Hakuto's back as she leans into him. Her hand slides slowly down his arm until it rests over the one holding the long knife, guiding his movement for the proper chopping technique. The apron isn't exactly thick—it's made of thin, simple fabric—and since she's not wearing anything underneath… Hakuto can very clearly feel the soft, oversized breasts of his little stepsister pressing into him. And no matter how hard he tries to ignore it, for a teenager in full-blown puberty, staying unaffected is practically impossible.
Luckily for Hakuto, he's also wearing a kitchen apron—long enough to (maybe?) hide from Yuzu's eyes the natural physiological reactions triggered in his body by that contact.
«Y-Yuzu… what are you doing?» Hakuto stammers—his face redder than the ketchup jar next to him.
«I'm teaching you how to cook, what else would I be doing?»
Yuzu's voice is so serious and natural that Hakuto actually starts to feel guilty.
~For once, she's not being perverted… so why am I the one having dirty thoughts?~
«Big brother, you're totally hopeless at cooking…» Yuzu sighs in resignation. «Today I'll handle the onions. You focus on whisking the mayonnaise emulsion and checking the noodles. And try not to overcook them! You know… I don't like soft things in my mouth. I prefer them hard!»
«Why do you have to be so ambiguous even when you're talking about cooking…?»
«Cooking? Who said I was talking about cooking? I was talking about—»
«Yuzu…!»
Hakuto cuts her off before his little sister can finish the sentence—a sentence that definitely wouldn't have been good for his self-control.
~Damn it… I can't see a thing because of these onions!~
Hakuto struggles to keep his eyes open as he vigorously whisks the emulsion in a large bowl. Maybe a little too vigorously…
«B-Big brother, what did you do…?»
Yuzu's voice comes out as a soft, clearly sensual squeal, dripping with playfulness.
With one particularly energetic whisk, Hakuto ends up splashing a generous amount of mayonnaise… right onto Yuzu's boobs and face! The thick white substance begins to drip between her breasts, sliding under the apron and even from her lips.
«S-Sorry, Yuzu! I didn't mean to! I'll clean it up right away!» Hakuto exclaims, clearly alarmed.
The boy grabs the first thing he can find—a damp cloth—and, still half-blinded by the stinging onion vapors, fumbles forward and starts vigorously rubbing the cloth over the spot his stepsister pointed to—her boobs.
«Oh, Hakuto, I didn't expect you to be so forward. If you keep going like this, I… aaah…» Yuzu gasps, letting out an exaggeratedly loud sound as she licks the mayonnaise from her lips in a sensual motion, her tongue slowly tracing her upper lip.
«Forward…? What are you—?»
Hakuto realizes a few seconds too late that he's been intensely massaging Yuzu's huge boobs. His temporary blindness kept him from noticing how intimate the scene really looked—maybe sparing him even greater embarrassment. Probably. Because as soon as her words sink in, he instantly tosses the cloth away and blindly feels his way toward the sink he vaguely remembers being nearby.
If Hakuto hadn't had his eyes shut from the burning, he would've seen Yuzu's boobs completely slip out from under the apron—it had been pulled down more than it should've been by his clumsy attempt to wipe her clean, and the cloth he was using, folded several times, dulled the sensation in his hand enough that he didn't even notice.
By the time Hakuto finally manages to rinse his eyes with water from the sink, Yuzu has already fixed her apron.
«I'd say we're done! Despite everything, these omurice turned out pretty good!» exclaims Yuzu with clear satisfaction, licking her lips—this time out of hunger. «Bring the water to the table and let Rika know dinner's ready. I'll prepare the servings in the meantime.»
Hakuto obeys, but freezes the moment he opens the fridge. The night before, when he had gotten up to drink a glass of water, he'd noticed a bottle of red wine nearly full. But now, the dark ruby liquid has dropped significantly—at least two glasses are missing.
~Could it be that last night, after saying she was going to bed, she came back to the living room to drink more wine? There's no other explanation—she's been with me all day. I need to talk to Rika as soon as possible. Yuzu is definitely a… peculiar girl, but she's still my little sister. If something's wrong, it's my job to look out for her!~
Lost in these thoughts, Hakuto is just about to open Rika's room door—when he suddenly stops, just a second before doing it.
~Right… I should knock first.~
Hakuto knocks his knuckles against his sister's door, but… it was only ajar, not fully closed. At his touch, it swings open suddenly.
Rika is completely absorbed in reading a book with a purple cover and black metallic trim—Hakuto instantly recognizes it as the same strange book Yuzu was reading the night before. But it's definitely not the book that grabs his attention: Rika is wearing nothing but pink lingerie, and the way she's lying on her stomach on the bed makes it impossible not to notice her perfectly round and firm butt.
«H-Hakuto…» Rika mutters through clenched teeth—she doesn't even look him in the eye. «I-I'll kill you!»