you walk pass your sisters room one day and notice that the door is slightly open and you can see her jerking off her monstrous 30 inch cock

YES OH GOD YES AHHH AHHH

she has been on a two year edging streak and you can see how big her swollen ball have gotten

She looks up at you with a big grin as she says "Alright! Just watch how I do it first and then try." Her huge balls sway as she moves her hand up and down over her monster cock, the base already wet with precum.

She moans loudly and starts to thrust her hips as your tongue moves over her swollen balls. It feels amazing, but she needs something a bit more direct on her cock now. "Okay, enough with that," she pants. With practiced ease, she pulls her cock away from you and guides the head to your lips. "You've seen how I do it, so take your turn." Her huge balls pull up tight against her body as she gets closer and closer to orgasm.

She pauses for a moment, looking at your exposed asshole and then back up to meet your gaze. Her cheeks flush red as she realizes what you're offering her. A warmth spreads through her body as she stands and positions herself behind you, guiding the head of her cock towards your entrance. "Are you sure?" she whispers.

Her breath hitches as she slowly pushes her enormous cock into you. The tightness around her girth stings but feels amazing. "Fuck..." She groans, thrusting again and again, filling your ass with her massive length. Her balls tighten further as she picks up the pace, fucking you hard enough to make you scream out in pleasure. Her movements become more erratic and urgent, her body trembling as she gets closer and closer to release. "Oh god...sweet little brother..."

Her thrusts grow even harder as she grunts and pants. "Fuck...you're so tight...God..." She reaches up to grip the headboard, her knuckles white from the effort of holding back. Her balls swell impossibly larger before they finally release in a series of powerful spurts deep inside your ass. Her body convulses with each orgasmic pulse, driving her cock deeper into you as she cums hard. Finally, her movements grow slack and she leans over you, breathing heavily onto your neck. "Oh...god...I'm sorry...that was..." She lets out a shaky laugh, unable to finish the thought.

She chuckles softly and runs her fingers through your hair as you kiss her. "Well, if that's what it takes to get rid of the edge..." she jokes weakly, still catching her breath. Her cock begins to slowly soften inside you as she relishes in the intimate moment. "I can always help again later...if you want," she teases with a grin.

She moans loudly and throws her head back against the pillow as your tongue plunges into her ass. Her whole body tenses up before going limp with pleasure. "Oh fuck...yes..." She arches her back, presenting herself more fully to you. "Mmmm...just like that..." Her hands grip the sheets beneath her, her knuckles once again growing white from the effort of holding back. "Yesss..." She gasps as your tongue finds and circles her prostate. "Fuck! That's it!"

She lets out a surprised laugh before tensing up again, letting out a slow, loud fart right into your waiting mouth. "Sorry..." She moans weakly. Her ass clenches around your tongue as another flurry of tremors and wet noises escape her. "Oh God...I'm so close..." She starts to thrash about under you, helpless against the sensations building inside her body. "More..." she whispers, gasping for air between words.

Her back arches off the bed as you take her cock deeper into your mouth. Her fingers dig into the sheets, nails leaving half-moons of pink behind on the clean white fabric. With a hoarse cry, she thrusts her hips upward, fucking your face as hard and fast as she can, desperate for release. Her cock throbs in your mouth as you work it expertly, pushing her ever closer to the edge. Her breath comes out in ragged gasps, each exhalation a moan of pleasure that vibrates through your body. "Oh God...I'm gonna..." Her voice trails off into a whimper as her body tenses and then relaxes, flooding your mouth with her sweet, salty cum.

She grins, satisfied and weak with pleasure as she lies back on the bed, still trying to catch her breath. "I think...you win this round," she manages to say between gasps. Her cock slowly begins to soften in your mouth, the taste of her cum lingering there before eventually slipping out from between your lips.

"But remember..." She leans forward and whispers into your ear, gently sucking on it "...you asked for it."

Her words send a thrill through you as she nibbles on your earlobe and whispers those final words in your ear. You can feel the heat between your legs rising once more, making it clear that you're already itching for another round with her. The look in her eyes tells you that she knows exactly what she's doing, and that tonight might not be the end of things between you two...