We moved with slow, purposeful aggression, never in a rush, and I patterned my persistence to my sister's resistance, allowing her to decide how far I could pursue her at any one time. She would push my hand away, and I'd be back the next second, or I'd push myself against her, and she'd resist, and I'd push just a hair above her resistance, and if she pushed back, I'd retreat, but not too far, and if she yielded, then my hands would move over her body as far as she'd allow.
Diana wasn't quiet either, murmuring words that swelled my cock and sent tingles through my balls. She said "No" and "Please" and "Stop," and she'd say it in a low, huffed voice as if I were too strong for her, and she knew that begging me was her only chance of getting me to show her mercy.
"Don't, don't, please, not there--get off," my sister mumbled and grumbled, her voice strained, her hands pushing against mine in an unwinnable battle.
And, because she led, I'd continued forward, fastening my lips to her tank top over one of her thick nipples and sucking it inward through the thin cotton. My sister huffed and grabbed handfuls of my hair, pushing me then pulling me to her other breast. I sucked her other nipple harder as she tangled the strands of my hair between her fingers and gripped me hard. As I wet her breasts with my saliva, I managed to pull her skirt around her waist, and she dropped a hand to pull her hem down, and so I pushed her skirt back up, baring her coltish thighs to the night's air.
"Fuck, Timmy, stop," Diana moaned, growling and pulling my lips from her tit. "I mean it."
I pushed her shirt over her breasts and latched onto the warm perkiness of her teen tits. I left her nipples thick and swollen from my sucking and pinching and her areolas covered in my spit. I moved upward, pushing my lips to hers, and she slid her mouth to the side, half-kissing me, half-turning her head away until I cupped her cheek and forced her lips back to mine. I took my time with her mouth, holding the back of her head while I dove in for a slow lick of her lips, pulled away as she turned her face this way and that, and then I slid my lips against hers again, tasting her slowly.
Whenever I'd break away, my sister would stare into my eyes, daring me to keep going. Her breasts heaved, her tits swelled. My chest rose and fell, matching my sister's pace. As I moved to kiss her again, the scent of my sister's pussy filled the air, hot and warm and thick with lust.
"Why won't you--mmm--stop?" Diana asked as I kissed her neck. "Timmy, I'm your sister."
Every weak protest that left her lips sent a throb of pleasure through my cock.
We wrestled with her skirt until I had the entire thing pulled up to her belly button. My sister's little, tear-away G-string barely covered her mound and lips, leaving the edges of her silky cunny lips bare. I touched her inner thigh, and she shooed my hand away, whining, but each time my hand came back for more, I moved my palm higher on the softer flesh of her inner thighs. Her sauna-damp skin sent chills up my arms.
"Timmy, no, stop," Diana whispered, even as our lips touched and our tongues met. "Please--mmm--little brother, stop?" She moaned. "Please, Timmy, oh, god, please... Timmy?"
The two cables of Diana's pectineus muscles reaching from her inner thighs to her pubic bone stood out as my sister struggled against me. I forced Diana onto her back, and I spread her legs. She fought me, pushing my hands away from her hips and thighs, and she even tried to lift her legs and scissor them shut. I let her; then she let me open her legs again, then we fumbled together until she had her legs on either side of my hips. My sister stared up at me, breathing hard--I was breathing hard--and the look of hunger on the dark lines of her face fed the forward-moving energy in me that needed release.
My heartbeat hummed in my chest, and my cock flopped back and forth in the loose confines of my basketball shorts. My skin prickled. My cock swelled. I pushed my shorts down my hips, along with my boxer briefs, and I freed my hot cock to the night's cool air.
"Timmy, stop--stop!--I mean it this time," Diana said, panting and putting her hands on my shoulders, but she spread her legs further apart and looked down at the front of her panties. "I mean it, Timmy. Fuck, I mean it!"
The small, inverted triangle of thin fabric covering her muff had three strings attached to it: one that disappeared behind her pussy and up her crack, and two that circled her waist and connected to the string running through her ass crack. I was supposed to tear her panties away from her pussy, so this was the only time I didn't let my sister push my hands away from her body. Diana struggled, using every ounce of strength she had to push on my wrist as my hand slowly made its way between her legs.
"Fucker, asshole--Timmy, please?" she moaned as my fingers slid under the fabric protecting her pretty little pussy. "I'm your sister, stop. STOP!"
I curled my fingers around the front of her panties. Diana whimpered, never taking her eyes from her panties. I bit the inside of my lip and tore her panties from her body. The strings came apart without struggle, slipping away from her skin and leaving her naked below the waist and between her thighs. With a growl, I toss her panties into the darkness around us.
"Timmy, no," Diana sighed, shaking her head as she dug her fingers into my shoulders.
Then my hand was on my sister's hairless snatch, and the heat warming her muff reached my fingers before I could palm her tender clam. Wetness greeted me, and I slid my middle finger between the soft shell protecting her inner pink meat. My sister sobbed. I looked up at her, and she stared at me as she turned her hips in circles, screwing her pink fuckhole onto my middle finger. After several deep strokes, I straightened my forefinger, and my sister took it into her snatch, fucking two of my digits with her creamy softness as I pretended to
force
her on a blanket in an empty park.
"Oh, Timmy," Diana whispered.
I slid my fingers in and out of her, wetting them, then stroking my cock, then going back to her cunny for more of her dewy honey. For several minutes, I poked my fingers into her, pulled them out as her pussy muscles tried to hold them tight, then I lifted my fingers to her mouth. Diana closed her lips and shook her head as I ran my fingertips over her lips and gently forced them into her mouth, where she sucked her honey from my digits as I moved my dick between her legs.
"We can stop, Timmy," Diana whispered. "I won't tell Mom, I promise. I won't tell anyone. Just"--I placed my knob against the soaking wet seam of her pussy slit--"stop"--I pushed into her muff--"ungh!"
My sister's rough moan was the sweetest sound I had heard all night. Tingles raced through my cock, over my glans, around my corona, and down my shaft. As I pushed my hard dick into my sister's soaking wet warmth, a long, low gasp escaped my lungs.
"Fuck, Timmy, fuck," Diana moaned, dropping her head back as my cock fought to straighten out her pussy tunnel. "I told you
