With grandpa snoring softly in the next room, I find myself alone with my petite step-sister, her cute face and small tits a temptation I can't resist. She's coy, playing with her phone under the blanket, but I can see her sneaking glances at my crotch. I lean in, whispering my filthy desires, and she hesitates before tentatively taking my cock out, her tiny hand wrapping around my shaft. She looks up at me, innocent yet eager, and begins to lick and suck, her tight lips stretching around my thickness. We keep our voices low, my hand on her head guiding her as she bobs up and down, her other hand sneaking under her panties to play with her teen pussy.