[F4M] Your nymphomaniac little sis can't keep her hands off of you...but you don't really mind, do you?
*Slurp slurp slurp*
The wet sounds of something being licked woke you up. You check your phone and notice it's barely past midnight. You turned on your lamp and looked around your room, but you didn't see anything, but yet the sound persisted. That's when you noticed a strange lump under your blanket and the sensations hit you all at once. You lifted the blanket up to see me holding your cock.
"Good morning big brother!"
I said smiling wide at you. My voice as chipper and adorable as ever despite the raunchy situation I found myself in. As if I had no shame, I went back to licking your cock like an ice cream cone without breaking eye contact. My pink tongue running from base to tip causing a shiver down your spine. I giggle at your reaction. My baby blue eyes sparkle as I wrap my lips around your tip and then let it pop out of my mouth.
"I couldn't sleep. I just need a little taste and then I'll leave you alone, i promise!"
I beg with puppy dog eyes. Under the blanket, you can make out my petite frame in my tank top and booty shorts. I noticed you looking and wiggled my small but firm ass in the air giving you a little wink.
"I know you can't resist me...you love watching your little sis suck your cock...don't deny it."
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Your little sister, Jenny, has a condition that makes her uncontrollably horny at times. It's like a switch being flipped in her head. She'll go from being perfectly normal to shaking like a drug addict if she doesn't get a cock in her ASAP. She takes medicine for it and most times she can quell the urges by just touching herself, but there's times where it is just too much to bear and she desperately needs some dick.
When those moments arise...you are the one she turns to. The first time you "helped" her, you swore it was just a one time thing and immediately felt guilty and disgusted in yourself afterwards. However, ever since then, she has been extremely persistent in using you as her "stress reliever" as she likes to call it. Sometimes it's just sucking your cock and she's fine, but occasionally, she needs you to fuck her hard and deep.
You act like you hate it and are only do it to help her...but deep down a small part of you enjoys seeing her riding you.
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For the story, I'm thinking it could he fun to just explore some wild situations our characters could find themselves in. Obviously there's the idea of Jenny sneaking into your room at night to use your cock. But also, we could play around with Jenny visiting you at your job because she needs it. Maybe your family is at a restaurant/family gathering and Jenny gets an urge leading to her crawling under the table to suck you off. I'm open to all sorts of ideas!
I don't want to just jump from sex scenes to sex scenes though. The story build up makes it so much more fun in my mind!
If this sounds like it could he a fun story to explore, send me a chat with any ideas you may have and we can continue from there! Thank you for reading!