I always knew how to push my sister's buttons. Ever since we were little, I enjoyed teasing her and having fun at her expense. I had always been a little of an asshole, I believe. I hid her bras, I smeared paint on her drawings, and I pinched her cheeks and stole her soda. Just innocent sibling fun.
These last few months, though... things changed.
"Bianca?" I asked, knocking on her door. "Are you there, Bianca?"
"Go away, Alec! I'm studying," she said from inside. I shrugged and opened the door.
Bianca was indeed studying, sitting at her desk, her chemistry book open in front of her. Even sat down, you could see she was a blonde knockout. Maybe it was something they put in the water, but ever since she turned eighteen, Bianca had put on some serious weight on her boobs. She must have been a DD cup by then, and she had changed tops and shirts one after the other, each of them becoming too small after just a few weeks.
She was also athletic, being on the running team, and she showed off her long legs with her short shirt. Her skin was smooth and sun-kissed, like she spent time tanning every day.
"You don't look like you're studying," I told her, walking to stand right behind her. Bianca froze, her deep-blue eyes never leaving mine as she tried to move away.
But I knew she didn't really want to.
"What do you want? You're interrupting me," she complained. Bianca was always complaining, until the moment she wasn't anymore. And she was begging for my dick.
"I don't see how my presence is going to interrupt anything," I replied. Bianca had always had a somewhat bitchy attitude. I was the only guy who knew how to deal with it. And she knew it as well. These days, she could not resist my presence anymore. Her training was proceeding so well. Though she liked to resist. Maybe it got her off, or maybe it turned her on... whatever. It turned me on as well. I liked to have this power, I liked to use it to make my little sister feel good... and I love to push her buttons.
She had several, all over her body. I called them buttons because they were spots were her sensitivity was so high every thought Bianca had turned to sex... every resistance faded, and even if she kept on being a bitch about it, she couldn't actually resist doing as I told her.
I knew she loved it, deep inside.
I pushed aside her blond mane from the nape of her neck. Bianca shivered in her chair, looking at me with a pleading look.
"W-what are you doing, Alec?"
"Me? Nothing. I'm doing... nothing," I said as I brushed the tip of my finger against the middle of her neck. You the point where the spine starts, below the head? That was one of my sister's weakest spots.
She shivered as my finger lingered on her spot. She squeezed her thighs and looked at me with anger in her eyes.
"Alec... I have... to... study... why do you always have to interrupt..."
"Am I interrupting anything?" I asked, feigning innocence as my finger kept on brushing her neck. Bianca shivered again and took in short, bursting breaths as I saw her nipples beginning to stiffen. She wanted this. She always wanted this.
Thought she might not go down without a fight.
"Alec! I have to study!" She swatted my hand away. "I have an important test tomorrow, do you understand this or not?"
"I do. I also know you'll study better when you don't have lingering thoughts in your mind. You know, distracting you."
"I don't have any lingering thoughts," Bianca retorted, her cheeks red, her breath lower. She was becoming hot and bothered with just one touch. It's so fun to have a sister like this.
"No? And here I believed you thought about sucking me off. Again. You can't keep your thoughts away from my big cock, sis."
"No, I..." but her deep blue eyes darted towards my crotch, even if just for a moment. Then they went back up again. "No! I don't have... I don't... I don't want your big... smelly... hard... cock..."
"I believe you do," I said as I put my fingers on the back of her ear, where the most sensitive skin was.
"Uuuh..." Bianca only managed to say, as she relaxed immediately, slumping in the chair. If the spot in the nape of her neck was her 'turn-on' button, this one was her 'turbo' one. She would not be able to resist me or my will anymore. Happy, docile, slutty sister. Just like I wanted her.
"You are going to suck my cock, sis."
"I'm not... uuuhh... why does it feel so goood..." she wailed as I kept stroking her behind the ears. She was like a kitty. A big-titted, blonde kitty, eager to suck and fuck after I petted her long enough in her special places.
"It's going to feel even better, little sis. Now, get on your knees and suck my cock. I want it nice and wet for when I'll fuck you."
"Geeez, Alec..." she said, shaking her head, trying to distance herself from my fingers. But she was losing her battle, I knew. She looked at me again, anger now battling with sheer lust in her eyes. "If I suck you off... will you let me study?"
"No, no, no, little sis, you will suck me off and then I'll fuck you. Then, if I'm satisfied, I'll leave you to your studies..."
"But it's unfair...!"