How Does It Feel to Touch Oppa’s Cock?

R first looked flustered. I froze in place, unsure what to do with my body. "H-Hurry up and pull it out!?" I despaired at the sight of my 'little sister' raising her voice. Only then did I realize what state I was in. "Ah, well, that is, um, you see…." My voice trembled. There was no excuse for this. The very fingers that had just been fondling my 'little sister’s' pussy hair were now in my mouth, sucking on the juices that coated them. And to make matters worse, my 'little sister' had come looking for the panties she’d left behind in the room and caught me red-handed. No matter what excuse I tried to stammer out, it wouldn’t work on her. Any attempt at justification would only sound pathetic.

"Uh… This is all part of my research—" "Cut the bullshit!" She was right. There was no bullshit more bullshit than this. Still, this was exactly when I needed to be shameless. If I tried to apologize and calm her down like some decent person… things would only get worse. Gulp— "…Bullshit? Why do you think this is bullshit?" I forced myself to stay calm and answered with the most innocent expression I could muster. "…Th-Then what the hell is it!?" My reaction had clearly caught her off guard. "When else would I get to taste this kind of fluid?" "…Fl-Fluid… what?" "Pussy juice, obviously." "……." My 'little sister’s' mouth fell open. Her face was already flushed bright red, steam practically rising from her head. "…You didn’t know? It was all wet earlier—" "Shut up!! C-Close your mouth right now!?" She looked like she couldn’t believe what she was hearing. "It’s fine. I’m not saying you’re weird or anything." "……." She looked anything but fine. Her shoulders shook as she tried to suppress whatever emotion was boiling up inside her. "This is just a normal physiological reaction. Look, I’m hard ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠too." "A-Ah…." She stole glances at my lower body, pretending she wasn’t. "And the fact that you got this wet is also just a physiological reaction, right? It’s beyond our control, completely natural. So let’s not feel too embarrassed about it, okay?" "……." I wasn’t sure if she understood, but the urge to lash out had clearly faded. I held up the finger that had been stroking her pussy hair moments ago and brought it back to my mouth without hesitation. "Sluuurp." "Ah…." I acted like it was the most natural thing in the world, the same way someone would lick yogurt off a lid. "When else would I get to lick something like this? This is all experience, all data. Every bit of it becomes fuel for writing erotic novels." I voiced the rationalizations I’d only ever ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠thought to myself. It might have sounded like nonsense, but given our current situation… in this bizarre context, it almost made sense. "You get it, right?" "…Like hell I do!" "Ah…." I thought she’d been listening quietly, but apparently she could still think rationally. In that case, I just needed to make it impossible for her to think straight. That was the conclusion I reached in the short time I had. My body moved before I finished thinking. I stood up and walked straight toward my 'little sister'. "Wh-What… what are you doing!?" My 'little sister', looking thoroughly frightened, backed away. Every step I took forward, she took one back. But in such a small room, this game ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠of tag couldn’t last long. Eventually she was cornered against the wall. Seeing her panicked expression made me feel like I was the one doing something wrong. "D-Don’t come any closer!" Her face and body were full of panic. She was so focused on keeping me away that every other thought seemed to have flown out of her head. "Look." I straightened my back, squared my shoulders, and spread my legs shoulder-width apart. "…Wh-What!" My 'little sister’s' gaze was already darting toward my crotch. Specifically, the spot where my pants were tented, my erection straining hard against the fabric. "This is normal. You getting wet is normal too. There’s nothing weird about it. Not at all." "Wh-Why do you keep saying that!? So what am I supposed to do!? And stop with that fluid nonsense already!" She reacted violently. Resistance was a better word for it. "I’m saying there’s no need for us to get worked up over something like this." "N-No! You licked your finger earlier!" "…Why? Do you want to lick mine too?" "No, I don’t! Are you actually a perverted freak!?" Her face looked like a ripe persimmon. The heat radiating from her body reached me, and I felt my own temperature rising in response. "E-Eek!" I grabbed her wrist the same way she had grabbed mine earlier and pulled it straight toward my crotch. "D-Don’t! What are you doing!?" She resisted fiercely, but she was no match for my strength. In the end, her trembling hand finally made contact with my erect cock. "Ahh!" My 'little sister' flinched violently, her body jerking. Still held by the wrist, she thrashed in place. "A-Ahh! What the hell do you think you’re doing!?" Her hand brushed against my cock again. Even through the fabric, it was the first time another person’s body had touched my sensitive, erect glans. The excitement and rush made my hips twitch. Seeing the bulge move, my 'little sister' shuddered again and tried to pull away. "…See? Your reaction is super realistic too. Isn’t this exactly the kind of help you were talking about?" This was probably her first time experiencing something like this… She’d never even dreamed of touching her own big brother’s erect cock. Her shocked reaction was only natural. "Th-That’s not something you can just say…!" "What’s the big deal? I already touched your pussy hair. Why? Want to touch my pubes too?" I said it casually. When I used my free hand to tug at my waistband like I was about to pull my pants down, she quickly turned her head away. "……." "……." Her reaction wasn’t what I expected. I thought she’d scream or ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠thrash around, but she just kept her head turned to the side. She was calmer and more obedient than she’d been at any point so far. After a brief moment of thought, I acted without hesitation. Swish— I pulled my pants down. With them pooled around my knees, I showed her my underwear. "…I’ve closed my eyes, so you stay still too." "……." She didn’t answer, but the fierce resistance from before was gone. I hadn’t expected her to actually be curious about my pubes. "Haa… Stop fidgeting with your fingers." At my words, my 'little sister’s' body twitched. My throat felt dry from the tension. I wanted to ask if this was how she’d felt earlier. "You know this is all research, right? So right now you’re touching your big brother’s pubes. Remember exactly how it feels and tell me later, okay?" "……." "Not gonna answer?" She still didn’t speak. But her body, which had been frozen like stone, began to move. She nodded repeatedly, her long hair swaying gently. "Haa…." I grabbed the waistband of my underwear. Wanting to look confident, I snapped the elastic a little harder than necessary as I pulled them down. The precum that had leaked earlier had already soaked the fabric. "Relax your hand." With my free hand, I grabbed my cock and angled it downward. Then I slowly guided my 'little sister’s' hand toward it. "Nngh!!" Even before it touched, she shuddered like she was having a seizure. A strange moan escaped her lips, and she quickly covered her mouth with her other hand, looking startled by her own reaction. "Alright, here it comes." Our hands were about ten centimeters away. The distance slowly closed. My 'little sister’s' fingertips trembled, her body still rigid with tension. Swish— "Kyaa!" It only brushed past. Yet her reaction was dramatic. "That counts as one, right?" "……." My 'little sister', trembling all over, didn’t seem to have heard me properly and just shook her head frantically. I brought her captured hand back to my pubes. "…Two." "Hkk!" She flinched again. The fact that her hand had touched me made my fully erect cock throb even harder. "Kyaaah!!" "Ah, sorry. My bad." It was deliberate, disguised as an accident. Her fingertip had flicked against my cock. "…Still, that was your first time touching your big brother’s cock, so you’d better remember it properly." I was so absorbed in the situation that my head felt like it was overheating. "And this is…." My 'little sister’s' hand was shaking like she had tremors. The gap between her fingers looked like the perfect space to slide something into, like fitting a Tetris piece. "…How does it feel to touch Oppa’s cock?" "Kyaa, kyaaaaah—!!"