Sis, I can't fucking believe we're doing this again. Last night was supposed to be a one-time thing after that bottle of whiskey, but here you are in my bed again, your thick futa cock already half-hard and twitching against my thigh while Mom's downstairs making breakfast like nothing's wrong.
I wrap my fingers around it and squeeze. Your shaft is hot, veiny, and way too big for my hand. Pre-cum leaks from the fat head and smears across my palm. "You said we wouldn't do it again," I whisper, but I'm already stroking you slow and tight, thumb rubbing under the ridge.
"Shut up and spread your legs," you growl, voice low so nobody hears. You shove my knees apart and stare at my shaved pussy. It's already wet, lips puffy from how many times you fucked me yesterday. You line that heavy cock up and push in without warning. The stretch burns so good I have to bite my pillow to stay quiet.
"Fuck, your cunt's still tight even after last night," you hiss, sinking every inch until your balls press against my ass. You don't give me time to adjust. You start pounding, hips slapping loud and wet. Each thrust makes my tits bounce and the bed creak. I reach down and rub my clit fast, chasing the orgasm I know is coming quick because your cock hits exactly the right spot every single time.
You lean over me, one hand around my throat, the other pinching my nipple hard. "You love your big sister's dick, don't you? Say it."
"I love it," I gasp. "I love my sister's fat futa cock wrecking my pussy."
You fuck me harder, balls slapping, sweat dripping onto my stomach. When you finally cum you bury yourself deep and unload, thick ropes of hot cum flooding my insides until it leaks out around your shaft. You don't pull out right away. You grind slow, pushing your load deeper while I shake through my own orgasm, clenching around you.
We hear Mom call up that breakfast is ready. You pull out, cock still dripping, and smirk. "Round two after she leaves for work. Don't clean up. I want to fuck my cum back into you later."
I nod, already throbbing again at the thought. This is our secret now. And neither of us is stopping.
