Give her what she needs.

Sighing, you lock the door behind you. "Sis," You say, "Your libido is going to be the **** of me." In response she just begins to make lewd, loud moans as she beckons you towards her. You hiss and hurry over to her, quickly covering her mouth with your hand. "Don't be so loud!" You whisper, an urgent undertone decorating your voice. As Shelly begins to lick your hand, and looks at you needlingly, you feel a tent starting to pitch in your pants. You obviously aren't the only one to notice this as you feel a small hand roughly grab it through the fabric. You grunt, as a small jolt of pleasure races through your body. "Shell..." You start, but before you can continue, your sister stops fingering herself and grabs the front of your shirt. In a feat of strength she pulls you down onto the bed and crawls between your knees, her ass angled high in the air for you to admire. You would scold her if you weren't so damned turned on right now.

She reaches your crotch, and slowly pulls your trousers down, your pants coming with it. As your cock reaches for the ceiling, your loving older sister wastes no time before covering it with her soft, warm- Oh fuck. The familiar, aggressive suction of your sibling eagerly slurping down your dick arises, as you cover your mouth to muffle your moans. Shelly reaches her hand up, and eagerly begins to massage your balls at the same time, stimulating you further, which is increased even more as you see her left hand return to fingering her own pussy, as she lets wanton moans down your shaft. Somehow, her being in the knee high grey socks is even sexier than her being in no clothes at all, and you can't help but admire her as she begins to bob her head up and down vigorously. You wonder how she became such a slut for you, seeing as growing up she did nothing but tease you about never having a girlfriend, but right now, you certainly were not complaining. You could feel pressure begin to build up as you drew closer and closer to climax. God, how many times had you cum in the last few days? You had lost count, between Bella and Shelly both seemingly out of nowhere wanting to jump into your pants at every chance. You groaned, reaching your hand down and grabbed your sister's hair, which you then used to hold her head in place as you jackhammered your cock down her throat. Closing her eyes, she moaned loudly, which was just what you needed to be pushed over the edge, as you exploded in her mouth, covering her mouth and throat in your hot and sticky spunk.

She pulled off, smiling giddily as she gulped it all down, genuinely enjoying every last drop. "God-" She breathed, "Your cum tastes so good John," She let a little dribble slowly crawl down her chin as she sat up. You began to sit up too, before being roughly pushed back down. "Oh no you don't stud..." She muttered, looking directly into your eyes, her own hazy with lust, "I'm not done with you yet."