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You never really were one to go to your big brother when the topic of love came up. He was always a really supportive and caring person, the best big brother a little sis like you could ask for, but he always teased and ribbed you when you talked about crushes and such. That was until you came to him with tears in your eyes. You were fresh off a break-up with your first girlfriend, bawling your eyes out even though you told yourself you wouldn't. Bracing for him to tease you like always, you were surprised when he wrapped his arms around you.
"Hey. It's okay, little sis. If she doesn't see how amazing you are, that's her loss." He said in a low, gentle but husky voice. It took you a second to process what he said. Those words felt so comforting, so safe. Just as it felt being in his arms. Without really thinking you embraced him tighter, not wanting to leave the calming embrace of his strong arms. You let your tears flow, and with them all that pain and sadness you'd entered that room with. As the tears faded, so did the pain. Your brother's fingers ran through your hair as you sank further.
Finally, after a seeming eternity, you spoke up, voice still shaky from all your crying. "Th-thank you."
"Of course. I'd be a pretty lousy big brother if I wasn't here for my little sis when she needed me." You felt his arms slowly unwind as he spoke, and were struck by an odd feeling. A need for his warmth and comfort and kindness. It made you feel weird, scared to even say it, but you needed him so bad you had to do it.
"H-hey... I know it'll probably sound weird but... are you okay if we cuddle for a bit? I just... need someone to hold me." In spite of your fears and trepidation, you were happy when he responded.
"Yeah, of course. Anything you need. I'll always be here for you." Those words made you feel your heartbeat for a moment, unsure of quite why. You're not doing anything wrong. Why would you feel so nervous?
As you lay down on the bed and feel his arms wrap around your waist, it feels so right. You cuddled your girlfriend before, sure, but you were always the big spoon since you had a couple inches on her. Your brother, though, was the one who had a few good inches on you. You never imagined being the little spoon would feel so good, so perfect. His face pressed to the top of your head, hot breath washing down the back of your neck like a waterfall. The tingling it caused made you feel all the hotter inside. Far more than that, as you soon noticed your panties feeling tighter.
The effort it took not to start panicking at the realization and draw attention to it felt herculean. With your brother still wrapped around you, you did your best to shift your position gently, crossing your legs to cover your erection. What you hadn't anticipated is what you'd feel after you did.
In the process of repositioning, your ass got pressed further into his crotch. Into an unexpectedly solid object. God, he had a couple inches on you there, too. Your face flushed hot and red as your thoughts began to race. It felt so wrong, you told yourself you shouldn't, but you wanted him so badly. Yearning, aching to know how good he'd feel stretching you out. Desperate to touch yourself yet knowing you can't. That was until you got snapped out of your haze.
"Hey, little sis, what... are you doing?" In spite of yelping in surprise, you feel yourself getting harder at the sound of his voice.
"I... ummm... w-well I... You... I-I-I-I-I..." The panic was too much for you to control, barely able to think of a sentence. Then your mind went blank when you felt his hand cupping your crotch.
"Well, well, well.~ And here I thought it was just me.~ You're quite the little perv aren't you, little sis?~" Those words coming in that teasing tone you know so well, yet slightly different. Almost sultry. In spite of wanting to protest, your body betrayed you as your cock twitched. "At least your body is honest.~" Now even more sultry in tone, your head spun as his words filled it.
"F-fuck... I... I just..."
"Come on now, little sis, use your words.~ I can't help you if you don't tell me what you want.~" In spite of your brain feeling like it's melting, you felt compelled to speak. Like you wanted to do everything he says. Though, perhaps, more like you needed to do everything he says.
"I just... Fuck, I know it's wrong, but I want you. I need you! P-please?... I feel so hot..." Whining like a needy little pup in heat, you heard your brother chuckle and then gently slide a hand in your pants.
Already wet with pre, it felt so good as he stroked you. His other hand slipped up into your shirt as he began to knead your tits. Low moans slid from your lips. All thoughts of protest had already left your mind by now. Replaced by that growing, deep need to be filled by him. Every stroke almost feels like a tease for the main show to come. Each squeeze only making that need deeper. Until you couldn't help yourself any longer.
"Please... Ahn... I need it... I need you inside me... mmmph... I can't take it any more, please!?" Sounding every bit of the slut for your brother's cock that you were becoming. The devilish smile it put across his face was practically audible when he responded.
"Of course.~ Anything for my slutty little sis.~"
Swiftly, he pulled your pants down and pressed the head of his cock to your needy, waiting hole. At first he was slow, letting your hole accept him in at it's own pace. You were practically panting like a bitch in heat already. Then, once he was buried to the hilt and crushing your prostate, he began thrusting in earnest. Every thrust felt faster and harder than the first, your moans loud enough to echo through the house with each one. His moans, in turn, only making it hotter. You could feel your cock leaking like a faucet.
Growling in your ear, your brother told you "keep moaning like a needy little whore and I'll have to cum inside.~" All that left your mouth was intermixed begging and moaning, barely even coherent. Still, he knew what you meant and wasn't gonna deny what you needed. His thrusts became an onslaught. Your brain practically turned off. All that mattered was making him cum. His moans now a low gravel, you could tell he was getting close. Until you both moaned your loudest and came together, you painting the sheets as he painted your insides. As you both came down from that high, panting like sprinters after a mile, you felt him gently pull out and wrap himself around you again. Feeling so warm and loved in his arms again. You really do have the most caring and supportive big brother any little sis could ask for.