Overnight Stay
She's pretty tall for a girl too. Her face looks cute most of the time, but it gets sharp the moment she frowns. Above all, her body is so alluring and beautiful it could make you forget, even for a second, that we're siblings. But nothing—no matter how tempting—could compare to the thrill of committing this sinful act with my blood-related little sister.
"What if you cum a ton inside the water, oppa?"
"How am I supposed to hold back when you're kissing me like that?"
"Dog perv."
"Yeah, I'm a perv."
Gyeo-ul plastered herself right back against me in the water where my semen was floating around. I'd just cum, but it still wouldn't go down.
"It's 'cause you're such a dog perv, oppa. You gotta kiss me more to make up for it."
"Can I touch your tits while I do?"
"No way."
She shook her head no, hiding her chest against my body so I couldn't reach. It was hot in its own way, though.
"Why? They're mine."
"...So shouldn't you treat them precious since they're yours?"
"They're not gonna break if I touch 'em."
"Sometimes you squeeze 'em so hard it feels like they might."
"You bite my lips when you're bored with them too."
"...Fine, then neither."
She pouted like she was throwing a tantrum, clinging to me while nibbling at my ear just enough not to leave a mark. She knew damn well I loved her tits, yet she kept pressing those huge things against me. ...Haa. I had to stroke her hair. She was so cute it was dangerous—I might've pinned her down right then if I didn't brainwash myself into thinking so. I had to hold out until she begged for it from those lips.
"Should we get up and rinse off soon?"
"I'm staying like this till the water drains."
"Okay, but can you stop biting? It kinda hurts."
"...Stroke my hair the whole time and I won't."
The moment I started petting her head, she turned obedient, and I held still with her in my arms. I opened the drain at the same time, and the water we'd been soaking in slowly swirled away. As the water level dropped, the hazy parts came into sharp focus—especially her hips. The curve of her ass following that line. Her thighs. The soles of her feet. Her toes. It felt like such a waste to just look at her flushed skin, warmed by the hot water. When I ran my hands over her, savoring the bounce and texture, my dick—which had softened a bit—sprang back hard as steel.
"Water's almost gone. Let's get up."
"...Can you pick me up, oppa?"
"I'll carry you if I get to do one thing I want."
"Sex... no. ...Just one thing."
Once the tub bottom was exposed, Gyeo-ul and I stood up together from the tub. To wash away the chill of the evaporating water, I turned on the shower. Streams poured over our bodies and back into the tub. We weren't even that dirty, but my throat felt parched and rough—I couldn't resist leaning in. I flicked my tongue at the water trickling from her shoulder, splitting down her back and collarbone, heading lower toward her chest. Her nipples were soaked enough to quench my thirst; I latched on like a nursing baby, sucking noisily.
"Hah... O-oppa. Aren't you the baby...?"
"Mom said I grew up without ever tasting breast milk."
Apparently because she was on meds for a while after I was born. She always said I was raised on formula. Maybe that's why I'm obsessed with tits even now. ...Well, even if it's just 'cause I like 'em, that's not weird.
"You got to drink, so this is payback. Payback."
"What the hell. Dog per—mmph..."
Meanwhile, Gyeo-ul had grown up well-fed on Mom's milk. Older siblings are supposed to envy the younger ones, right? After sucking on her tits for a good while, rolling her nipples with my tongue, Gyeo-ul's body had gotten nice and sensitive. A light tap on her waist made her twitch; pinching her earlobe between thumb and forefinger drew out a satisfied little hum. ...Haa. My dick's gonna explode.
"...I'm done drinking. Let's wash up."
"Ah... y-yeah. Mmm."
I gritted my teeth, ignoring her near-melted face, and squirted body wash all over her tits, spreading it around. Of course, rubbing it straight on bare skin didn't make much foam—it just made everything slicker. ...I wanna slide in. Or stick it in my mouth. Just a bit longer. I'll make her beg once I take her down on the bed.
"Shampoo?"
"I'll wash your body if you do my hair."
"...You're just using that as an excuse to grope my tits, perv."
"Not just that?"
I was a little hurt that my sister saw me as nothing but a tit-obsessed sex monster. I'm not that much of a perv. Just a normal guy with normal thoughts. Sure, her tits make me wanna touch 'em anytime, but...
"Everything about you turns me on anyway."
"...You really are a dog perv, oppa."
"It's normal to feel attracted to the person you love."
Not just her tits—her waist, thighs, ass, hips. Any of it could get me off over and over, so it wasn't exactly the healthiest logic. Even if I blocked off her upper body and fucked her, I probably wouldn't get bored. ...Maybe cover her with a blanket sometime. Nah, she'd hate it 'cause no kissing. I prefer seeing her face anyway. Her melted expression is hot, and her embarrassed look is fucking insane.
"...Total perv. You only see me with those horny eyes, huh?"
"Not at all?"
"I don't believe you one bit."
She grumbled but diligently washed my hair. Of course she was lovable and sexy, tempting me to fuck her right then—but it was also true I could live platonically with her forever. Just living together would be fun. Every little thing like this.
"So prove it, oppa."
"What more proof do you need here?"
"I'll test how much you love me after we rinse. ...Pass, and I'll give you a reward."
"...And if I fail?"
"Obviously, punishment."
Her face was half playful mischief, half seductive gaze. ...How am I supposed to prove more? Surviving this long on just kisses and hand-holding should be proof enough, right? With equal parts anticipation and worry about what she'd do next, I rinsed all the suds from our hair and bodies.
Haa... Gonna need another shower soon. Or maybe just crash without one.
We patted off the water with towels and slipped into bathrobes. Just a quick tug on the belt and we'd be naked—slutty as hell. But the color was this pure ivory close to white. ...Perfect shade that wouldn't show stains. Too lazy to dry our hair, we dove onto the bed facing each other. I feel it all the time, but... half-covered is way hotter than full nude. Nude's better for groping, obviously.
"Gyeo-ul. When's this test? The test."
"...Oh, wait a sec, oppa."
She'd brought it up herself but seemed to have forgotten—suddenly she sat up, grabbed my outer clothes, and rummaged through the pockets. The underwear and socks I'd bought and tossed in earlier, wallet, phone, watch. She dumped them all on the floor and pulled out a box from the deepest pocket, ripping open the last plastic wrap to take out the contents.
"What's that for?"
"...The test, remember?"
Then she crawled back to bed and yanked off my bathrobe. My upper and lower body were fully exposed, of course. My dick, nowhere near going soft. Gyeo-ul let out a deep breath at the sight of it still standing rigid, then started rolling the rubber she'd been holding onto it.
"...Gonna do it with that on?"
"I said no sex today. ...I'll do something else."
"That's the test?"
"...Yeah. If you really like me."
"Yeah?"
"Can you cum... just from kissing?"
Unheard-of idea. ...But somehow, it felt doable. Cumming from pure kissing might be tough, but with some hugging and brushing... Probably. It was close earlier anyway.
"Why the condom, though?"
"...Cumming straight would dirty the sheets."
...Oh, right—this is her friend's place. Yeah, can't mess up her friend's bed. I nodded quick and pulled the blinking Gyeo-ul into my arms. The faint shampoo scent spread. Haa... To pass this test, I undid her bathrobe.
"Oppa! Just kissing...!"
"Can't you let a little skin touch slide?"
Mwah. I stole a light peck while she was off-guard. So sweet. Her flustered lip-bite made it even sweeter.
"...Just up to here? Can't take more off?"
"Fine, fine. ...Just keep kissing, got it?"
"Talking's okay too. ...But no horny hugging and grinding—that's disqualification."
"What's my reward if I pass?"
"I do whatever you want. You do whatever you want. ...Till midnight."
Shockingly generous prize.
"And if I fail?"
"Then... I do whatever I want."
Equally shocking risk.
"...How long?"
"My call."
"What the hell."
Unfair rule.
"...Till kissing you gets boring. Then test over."
"...Yeah, that's fine."
Listening closely, there wasn't much downside, so I accepted. Anyway... what we both wanted from each other was the same. Stay by my side forever. Love me forever. Look only at me forever. Just a slightly different way of expressing it. So... win or lose, it probably wouldn't matter. We'd be tangled together till the date changed either way.