"A-are you high?" I spluttered.

"Nooope," Rae drawled lazily, waggling an almost-empty beer bottle. "Just a couple of these."

"And that's enough to make you forget I'm your goddamn brother?"

She giggled, lolling back on the couch in a way that made her yellow crop top ride up, defenselessly exposing her soft, pale midriff. "I don't care!" she whined, draining the last sip of her beer as she flopped all the way over the arm of the couch. "I've been soooooo horny since Brian dumped me! Pleeease?"

"I can see right up your skirt, you slut," I snapped, trying to resist the urge to get a good eyeful as my sloppy-drunk sister rolled around, throwing what could only be described as a tantrum. Her denim skirt was much too small to hide her bubble butt and thick thighs at the best of times, but the way she splayed and kicked her legs was putting an exorbitant amount of skin - and white cotton underwear - on display.

Instead of getting mad like usual, though, the faintest hint of a devilish glint could be seen in her glazed eyes. "Ooooh~!" she cooed, dragging herself into a roughly upright position and grinning viciously. "Peeper, pervert, looking at my panties!" she half-sang, her voice unsteady. "Does that mean… you wanna see more?" As she asked this, she reached down with one hand, daintily plucking the front of her skirt up and spreading her legs as she did. Her thighs squished and deformed where they met the couch, presenting a thick, unbelievably soft-looking niche between her legs, where those thin white panties were all that prevented me from seeing-

I tore my eyes away, scowling at the ceiling. "No. No! You're insane. Put that away already and I'll forget you ever asked."

"C'mooonnnn, Alex!" she whined. "I just need a good licking! Nobody's eaten me out in like a month!"

"Did not need to know that," I grumbled, even as I felt the front of my pants tightening. "And the answer's gonna be no, no matter how many times you ask!"

"Are you suuuure?" Rae crooned, as I heard her get up off the couch, stumbling as she did.

Glancing back, I barely had time to react before she was crashing into me, practically leaping into my lap and falling all over me. "Jesus, Rae!" I yelped, attempting to wriggle my way out. It was no good, though; she'd always been bigger than me, and it was as if the alcohol had given her extra strength.

Her ample breasts mashed into my chest as her hazy puppy-dog eyes roamed my face. Tears even welled up in them as she slurred my name hopefully. "Aleeeksh!? I need your help! And you're really good at it!"

Trying to ignore my erection, which grew rapidly against my will, I focused on the absurdity of that statement as I kept struggling to escape. "And how would you… know that!?" My nose wrinkled as her hot, boozy breath rolled over me.

She gave a lopsided, evil grin. "Becca told me~~! She said you did it for her for hourrrrs, till she saw stars. So why won't you do it for mee?" She looped her arms around my neck, wriggling her ample butt in my lap as she begged.

"Because she was my girlfriend, and you're my fucking sister!" I snapped, finally mustering the strength to push her off me and leap to my feet. I glanced at Rae one last time as I headed for the hallway. "And you reek of alcohol, so the chances are even less than zero, anyway. Good night."

Ignoring her plaintive drunk wailing, I shut myself in my room and flopped down on the bed. God, the sooner I could move out the better. We'd both come home after college, but I had always expected Rae would be gone by the time I did. The Brian thing had been promising, but he'd tossed her aside before they reached the moving-in-together stage.

It had been rough on her, to be fair. Very messy. But that didn't mean she could get drunk and proposition her younger brother. "Fuck," I grumbled as I tried my best to forget how her thick, curvaceous body had felt when she slumped against me. Was she stupid? Any straight man would fold in an instant if she pulled that trick. Rae was twenty-six, with long dark hair, a perfect heart-shaped face and a body whose slight chubbiness only accentuated her curves. She would be a dream girl for anyone…

…except her younger brother.

Groaning, I tried to take my mind off things and get ready for bed. She would regret it in the morning, if she even remembered. I only hoped it wouldn't be too awkward.

I was awoken by a heavy creak as someone clambered onto my bed. Blinking against the fog of sleep, I cast about the room in a slightly befuddled panic as a weight settled onto my midriff, pressing my body down into the soft mattress.

"Th'fuck…" I groaned, fumbling for the switch to my bedside lamp.

A hand grabbed my wrist, pinning it to the pillow. "Shh! Alex, it's me!" Rae's voice. Softer, gentler now.

As I blinked hazily, my eyes started to adjust to the darkness. My sister was straddling my waist, bearing down on me as she held both my wrists in place. She wore an oversized t-shirt, accentuating the size of her bust and hanging loose over her torso. Her bare legs were tucked on either side of me, thighs barely covered by the shirt.

"Rae…" I croaked. She had a little bed head going on too, clearly having not long woken up herself. "What are you doing?"

"Apologising," she murmured. "Don't panic, okay? I'm sorry about last night. I just…"

"It's okay!" I said quickly. "You got white girl wasted, it happens. Now can you let me-"

"No!" She cut me off. Her nails dug into my skin, a pressure that made my spine tingle. "That's not… I don't want…" Her voice caught in her throat, and I realised there were tears welling up in her eyes again.

"I know," I said, trying to be as reassuring as I could while pinned down in my own bed. "I know you didn't mean it, the alcohol just made you say some shit you didn't believe. You're frustrated, I get it. We can forget all about this, so just-"

"No." Her voice was steadier now, calmer. "No, I came to ask you one more time."

My heart froze. "Rae…" I said slowly. "You're not still drunk, are you?"

She shook her head. "My mind is clear now. I'm sorry I got so drunk last night - I know you hate it - but it was the only way I could find the courage to bring it up."

"You mean…"

Nodding bashfully, she leaned forward a little to look down into my eyes. In the semi-darkness of the morning, her hair fell like a wild curtain around my face. "I mean I want you, Alex. Ever since Becca told me that… and Brian dumped me like I was trash… I haven't been able to stop thinking about it."

"I'm your brother!"

"You think I don't fucking know that!?" Her surge of anger seemed to be directed at herself more than anything. She took a breath and continued more calmly. "I'm not asking for anything risky. Just eat me out."

Another tremor ran down my spine. Hearing her say it sober was certainly a different experience. "That's risky enough, Rae," I said weakly. In truth, my resolve was rapidly eroding for reasons I couldn't quite understand. "That'd be crossing a line we could never take back."

"Little brother," she said seriously, "I have snuck into your room and locked the door behind me at five a.m. with no panties on. I think we've already crossed the line."

"No p- you're not wearing anything under that?" My voice was practically a squeak.

Rae shifted in place, rocking her hips just a little as she grinned down at me mischievously. "Wanna see?"

"…………Fuck it. Show me."

That got… a little longer than I planned, but c'est la vie. Long story short, my sister wants to sit on my face. And probably more. This is going to cross several more lines, but how quickly we do is up to you. This could also be combined with my other incest prompt if you'd like.

• Nobody is really being taken advantage of.

• We should feel guilty about this, but we don't really.

• I usually write first or third person, this prompt just wound up as a mixture because that's easier when I'm writing both characters. Let me know which you prefer for actual roleplay and I'll roll with it.

• Pick up from here, or wind back the clock to explore how we got there, or bounce your own ideas off me before starting. All fine options. <3