Biology lesson

Cherry got there early. Sophie opened the door with her hair still damp from the shower and a towel slipping off one shoulder. Her little sister had promised to help, but Cherry knew the real arrangement. "She said we had human anatomy today," Sophie smiled, taking the textbook from Cherry's hands. "Guess I'll just have to show you the real thing." She led the petite redhead to the bedroom and peeled her cotton panties down, slow enough that Cherry could smell her cunt before she saw it. Sophie spread her own legs open and parted her lips with two fingers, showing Cherry the slick inner folds and the tight entrance that twitched when she touched it. Cherry knelt down and watched closely, the homework forgotten, while Sophie stroked her clit in lazy circles and talked her through every trembling detail. Soon Cherry's tongue was buried between those smooth folds, tracing wet circles around Sophie's swollen clit, tasting how different the texture felt once she was licking it instead of reading about it. Sophie pulled Cherry's panties aside next and buried her fingers between Cherry's slim thighs, working two of them inside that young, dripping pussy with steady, deep strokes. Cherry's small tits bounced lightly while she rode the fingers, her homework notes crumpled under her knees, and both girls forgot the assignment entirely once Sophie climbed on top to grind her slippery cunt against Cherry's.