After 20 years of life... I really should have learned to knock by now.

I stood there, stunned and slack-jawed, gazing stupidly at you as my face deepened into a crimson blush. "Oh my god," I squealed, clutching fiercely at the door handle. Whatever I had barged into your room to talk to you about was forgotten.

You were lying on your bed, naked from the waist down. You had your cock caught in a death grip. It was pulsing hard and partly veiled by lacey pink panties.

My eyes flickered with recognition. They weren't just any panties you were stroking your big fuck stick with; they were my panties! A pair that went missing last month—I thought I left them at a Tinder hook-up's place. Now, I knew differently.

"Alice," you croaked, eyes bulging out of your head. "Close the door!"

"Oh my god!" You didn't have to tell me twice. I slammed the door with a resounding crash. Then, with silence ringing in my ears, I got to thinking. Several emotions wrestled for prominence in my head. The initial flush of embarrassment gave way to hot outrage, followed quickly by vague amusement and the strangest sense of satisfaction. So, my little loser brother liked to jerk off into my panties, huh? That changed things. I grinned a wicked grin and barged right back into your room.

"You little pervert!" I hissed.

"Huh?" You gawped at me—a big, dumb buck caught in the headlights. You now sat at the edge of your mattress, and my panties were nowhere in sight. Notably, you were still hard—and I was right. You had a nice-looking cock.

"What do you mean, huh?" I asked, slamming the door behind me. "I just walked in on you, yanking on your meat with a pair of my panties!" I made a vigorous wanking motion with my hand for added emphasis. "Or were you hoping I hadn't noticed that little detail?"

You clasped your hands over your face. "Well—"

"Where are they?" I interjected.

"Under my pillow..." you answered sheepishly.

"Get them," I demanded, looming over you with my hands on my wide hips.

You twisted around to retrieve them. I took the opportunity to examine what my little brother was working with. Yeah, you definitely had a nice fucking cock—and it was still pulsing hard; I licked my lips.

"Here," you sighed, offering the lacey pink panties out to me without meeting my roaming gaze. They looked crusty and well-used.

I shivered—but not out of disgust. Oh god, somehow, this entire situation was turning me the fuck on.

"I don't want them," I said, putting an edge to the words.

Your eyes snapped up, swimming with confusion and shame.

I smirked. "You heard me." I reached out both hands, closing your fingers over the pink silk and insistently pressing my panties back at you. "Show me what you were doing."

"What?" You gawped up at me.

"You heard me," I purred, mischief glinting in my green eyes as my smirk widened into a grin. "Show me what you were doing before I walked in on you."

"You—do you mean..." You squirmed awkwardly.

"Yes," I purred, making the same wanking motion as before. Then, I sauntered over to your gaming chair, swivelled it to face you and parked my thick ass in it—signalling that I intended to watch you jerk off. "Get on with it," I folded my arms over my tits. "Before Mom and Dad get home."

You eyed me suspiciously as if this might all have been an elaborate trap.

"I know you want to," I said, my voice softening. "Look how fuckin' hard you are, dude... Fuck, I'll bet you've even daydreamed about something like this happening, haven't you?"

The way you looked at me said it all.

"I knew it," I declared in a sing-song trill. "You fucking pervert!"

Your face flushed. "I'm sorry," you blurted out.

I was way past being mad about this. Whatever this was, it wasn't an admonishment from me. It bordered somewhere between tacit scolding and raging approval. "So, make it up to me..." I purred. "Show me how you... do it."

You nodded uneasily. "Are—are you... sure?"

"It's the only way you're getting out of this," I answered mischievously. "Don't act like you don't want to."

I leaned back in your comically-oversized gaming chair and spread my legs, watching as you wrapped my panties around your gorgeous cock, stroking them slowly up and down. "Good," I muttered, biting my plump lip. "But when I caught you just now, you were really going for it..."

That seemed to spur you on some—your grip picked up some steam, as did your breathing.

"Very good," I mewled, clearly enraptured by your performance. "You know, you have a nice fucking cock?"

You groaned. "Yeah?"

"Mhmmm," I moaned, slipping one manicured hand between my legs—rubbing myself through my black jeans. "You think about fucking your big sister with it?"

"Yes," you answered doggedly, hunched over and furiously beating at your meat.

"That's why you stole my panties?" I asked, driving my fingertips against the denim seam at my crotch.

"Yes!"

"So," I began, a breathy moan escaping my lips, fuck, I was getting into it. "You wouldn't mind seeing big sister's tits?"

You shook your head—some savage glint sparkling in your bulging eyes.

"Thought not," I giggled. Then, I found the hem of my sweater and pulled it up my tight body. I never wore bras around the house—my pale c-cup breasts spilt out, pink little nipples pointy and hard. "What do you think?" I asked, pressing my pale cleavage together. "They as good as you imagined?"

You answered by picking up the pace even more, moaning.

I took that to mean you liked them. "They're soft," I purred, massaging my tits and pinching my stiff little nipples. "Fuck, I'm getting turned on over here..."

You looked slightly taken aback by that.

"It's not like I haven't had some... off-colour thoughts about you," I explained. "Sometimes, when you come home from the gym... just the smell of you..." I snapped myself out of it, shaking my head. "Hey," I said, smiling, "bet you also wanna see my pussy, right?"

Before you could respond, I was on my feet again, shimmying my jeans and black panties past my hips. The air felt cool against my bald, slick cunt. Fuck, I was wet. "Here," I said, stepping out of my jeans. I bent over, fishing my black panties from the jeans and tossing them to you. "Use these instead."

You were too stunned to catch them—they hit you in the face and fell.

"They're fresh," I purred, grinning wildly. Then, I fell back into the leather embrace of your gaming chair; I could feel the intensity of your gaze as it followed me down. I spread my legs—my cunt parted a little, pretty pink insides peeking through. "Go on," I urged.

You swapped pink panties out for black panties. I wondered with a wicked smile if you ever - even in your wildest dreams - imagined me, your big sister, gifting you an additional pair of my panties—on the condition that I could watch as you used them as a cum rag.

As you doggedly jerked yourself for me, I slipped a couple of delicate fingers down between the lips of my snatch. "Mmmm, I'm wet," I purred, penetrating myself a couple of knuckles deep with a lewd squelching noise. I withdrew my fingers, holding them up for you to see—they glistened. "See?"

You nodded, going caveman mode on your leaky prick.

"Wanna taste?" I asked testingly.

You grunted and nodded again, more insistently.

Wordlessly, I stood up and crossed the small expanse of carpet between us—my sticky fingers outstretched in offering. Standing naked over you, I held out two slender, prettily manicured digits - slick with my juices - mere inches from your lips. Your ragged breath broke in waves against them. You parted your lips, sucking them into the warmth of your mouth and lapping at them with your tongue. You were surprisingly gifted with your tongue—enough to make a girl wonder about other areas it might prove quite adept.

I had to stoop some as I reached down with my free hand to grasp your furiously pumping wrist. You moaned in mild protest around my fingers and shot me an inquiring glance. I answered by raising your hand up to my cunt's heat. "Touch me," I said, reaching back down and wrapping my grip around your prick—I could feel its pulsing heat through my panties. "And I'll touch you... Deal?" I began to pump my grip slowly up and down.

You nodded your head, suckling my fingers more insistently as your fingers went to work exploring my delicate folds.

"Ooo," I moaned when you found my clit, drawing a sharp breath and squeezing tight on your cock. In show of appreciation, I began to twist my grip as I beat you off with my panties. You seemed to like that, going off the way you hummed around my fingers. "Y—yeah?" I purred breathily.

You nodded your head, and I returned the gesture insistently, my eyes glassy with lust. "F—fuck me... with your fingers..." I instructed, a devilish little smile curling my plump lips.

I moaned in approval as your fingers curled down my slick lips and found my tight little opening. "Fuck me," I groaned. Then, I gasped as two of your fingers pressed inside. Your digits were thicker than mine—I felt my cunt stretching even as it gripped needily around them. "Fuck me," I repeated, subjecting your cock to a death grip as I pounded my grip awkwardly up and down its length.

Matching my urgent energy, you began to fuck your big sister with your fingers, drawing lewd noises from her sloppy cunt.

"Oh god," I groaned. "Fuck! Curl—curl your fingers inside!"

You did.

I began to grind myself against your hand, tits jiggling for you as I met the cadence of your pummeling fingers. "Oh..." I moaned, withdrawing my fingers from your mouth and seizing a fistful of your hair. "I'm gonna—I'm about to..." My breath hitched in my throat as my cunt quivered around your fingers. Slack-jawed, I whimpered and trembled, riding the turbulent waves of the crazy-intense orgasm ripping through me.

In the blazing afterglow, I fell to my knees on jelly legs, smiling vacantly. Nothing else ever made me cum so fast as you - my nerdy little brother - had just done. Oh god, that could only make me a pervert, right?

I looked up and saw that my right hand was still wrapped around your cock, grasping it through my panties. Without thinking, I sat up onto my knees and did away with the silken veil—tossing them at your pillow. Sparing you the briefest glance, I leaned down and unceremoniously engulfed your angry-red tip between my lips. You were about to learn why I was always so popular with boys.

I purred in slutty approval of your cock's flavour. Salty. Manly. I savoured it as my tongue lapped and swirled around its salty circumference.

You groaned brutishly. I felt your hands entwine themselves in the thick curtains of my hair. "F—fuck, I—I can't believe you're doing this."

I batted my eyes up at you appreciatively. Then - still smiling at you with my eyes - I pressed the grip of my lips down until your bulbous tip was lodged against my convulsing throat.

"Argh," you grunted, grip twisting in my hair.

I hummed around you and propelled myself down, taking you in my throat before retreating, only to repeat the motion again—forcing you deeper inside my velvet throat's massaging wrap.

"Oh, fuuuuck." You writhed on the bed, lifting your hips and holding my head in place to press yourself deeper.

I sputtered and heaved, churning up mucus and thick spittle around your length. Tears blurred my vision and rolled down my cheeks, but I did not pull away—I sensed you were probably close, and I wanted it right down my throat. I began to click my tongue against the underside of your meaty shaft. At the same time, I reached up a dainty hand and gently fondled your tightening ball sack, wordlessly urging you to cum down your big sister's spasming throat.

You did. In one moment of pure bliss, you cried out savagely, pressed me down and gave up the goods.

I sputtered, feeling your balls churning against my sloppy chin as your cock lurched suddenly in my throat, one, two, three, four times. I wrestled against your grasp, hands clutching at your thighs, wrenching myself away—retching up stringy throat slime and cum bubbles. I coughed, my ample chest heaving up and down as my senses gradually returned to me. "Fuck," I gasped, bloodshot eyes gazing vacantly up at you. "Was—" I wiped my mouth with the back of my hand. "Was that good?"

"Y—yeah," you gasped.

"Good." I giggled, standing up and assessing myself. "You made a mess," I observed.

You sat there, dazed and dumbfounded, watching me dress.

"This stays between us, you hear?" I asked, pulling my sweater down over my slimed tits.

You nodded.

"You can keep the panties," I said, pulling up my jeans. Then, turning to leave, I looked over my shoulder and said with a teasing smile, "You might even earn yourself another pair soon."