Your hand!

You try not to appear too eager, drooling on your hand before wrapping it around your father's thick, throbbing shaft...burying your head in his powerful chest, trying to muffle the moans as his single finger finds places inside you that you never dared dream existed...

Your hand moves on autopilot, sliding slickly up and down the shaft, doing your best to ignore how hot it feels against your hand, the way it throbs against your palm, the way you can barely close your grip around your father's girth. You can't stop yourself from imagining with dread what his cock would do to you, if his single finger frigging you has you on the verge of cumming.

Your body is betraying you, grinding your ass into your father's hand as it squeezes wet whimpers out of your soft cheek, and bucking your hips to feel his finger slide deeper inside your hungry hole. You can feel your cock drooling in your panties, ready to explode. You know you need to do something drastic.

"Ooh Daddy, your cock is so much bigger and manlier than mine. Please, won't you show a pathetic little sissy slut how a real man cums?" You stare up at him with cowed lustful eyes and coo sweetly. You feel his cock twitch in your hand and you know he's close. But his finger speeds up in your ass, so close to pushing you into the sea of roiling cum rising inside you...

"Pwetty pwease Daddy Bear. You baby gurl wants to lick up evwey last dwop of your yummy cummy." You lean up on your tippy toes, giving your father's bottom lip a light little lick. He grunts, staring down into your doe eyes with a mix of fiery lust and blazing rage. You aren't sure which scares you more...

You can feel your father's cock swell and throb in your hand, he's going to blow any second now...but you can also feel your own cock ready to fill your sister's panties with sticky spurty squirts.