Nack X Shemale! Nic
I must have been drunk or something. That's the only explanation for this. I started roaming around and stumbled upon that fox kid's place. I saw all sorts of gizmos and gadgets, formulas were strewn all over too. Geez, for a genius, he sure is unorganized. My eyes caught onto a weird formula, it was a pink liquid with a heart on it, and it had a male and female symbol on it. I snatched it and rode the Queen home, Nic wasn't back yet. I was waiting for her to see this.
Bored of waiting, I curled up on the couch and closed my eyes. I didn't know what time it was or how long I was asleep, by the time I woke up and gave out a yawn, I heard the door open and close. I wiped the sleep away from my eyes and saw Nic walking into the room. "Hey, Nack. Got done with a job." She said to me, I nodded, still waking up.
"Had a nap, did ya?" "Mh, hm... *Yawn*, Sorry... still wakin' up. Oh! I got something!" I said and showed her the vial with the weird symbols. She stared at it and turned to me. "Where'd you get this?" I grinned. "Stole from Sonic's little sidekick. He was out so..." I gestured to the vial as if that answered everything.
She nodded and crossed her arms, clearly in thought. "Love potion perhaps? But then... why would that kid make one?" Nic said, she was always the thinker, I scratched my chin and held it up. "We could... uhm... t-test it..." Why did I sound so weak? Was I scared? I must be. "Okay... but who's gonna drink it? And what are the effects?"
I looked at the label and saw some small writing, I squint my eyes and read outloud. "Gender... transforming... potion? Wait, he wanted a sex change?" The two of us burst out laughing at this, I set the vial down and stared at Nic. "... Nic, if something happens to you and it's bad. I take full responsibility. I... I couldn't live if I did anything to hurt ya..." I said, being all sappy.
I hated being this way, but it shows that I care about her, need her, and... always love my sis. She hugged me and kissed my cheek, making me blush a little. "We may argue a lot... but I'll always love ya. And besides, I'll break your arm." Nic said casually at the end, I chuckled and smiled.
"You first?" I gave her the vial, she popped the lid open and drank a little bit of it. She put the lid back on and set it down on the table, she gave a grimace and shook her head, I bit back a chuckle at seeing her expression. She turned to stare at me and rolled her eyes. "Go ahead, laugh." I did so and grinned. "Taste bad?"

She groaned. "Ugh, taste like piss. Now... I wonder when-" She stopped mid sentence when she started groaning, I looked worried and helped her up. Was she hurt? What's happening?! Then, I stared down and my face flushed. The pain that Nic seemed to have was gone... and... down below...
Nic looked down and saw what I was staring at and what left me flustered. There was a bulge where her crotch is. I realized what I'm doing and turned around, covering my eyes. "Gah! I'm sorry! Oh, fuck... I'm a pervert! I'm so, so sorry Nic!" I said, Oh, Chaos, what was I doing?! She's my sister for fuck's sake! What's wrong with me?!
I heard some movement and something dropping to the floor, I lowered my hands a little and stared at my sister, she had a penis now and some balls. Hell, it looked big. It must have been 10 inches compared to my 8. I can't believe it... she's bigger than me. She looked at me and grinned, pulling an arm around me held my hand.
"So... getting aroused by your sister, eh? I didn't know you were that perverted, brother." Nic said to me seductively. Wait, seductively? What the hell? "I... I... N-Nic... I didn't..." I stuttered, trying to come up with an explanation, but my brain was shutting down. She put a finger on my mouth and whispered to my ear. What she said made my eyes wide and gasp.
"Let's really test it out, Nack. On your knees and head to the couch." Is... is she serious? She walked over and sat down, she gestured me to come over and I did. I walked over and went on my knees. I must have looked so scared and nervous as hell. She lifted my hat, placed it on the couch and ruffled the tuft of my hair.
"I won't hurt you. I promise." She said softly, I bit my lower lip and whimpered. "I... this is wrong... is this potion making you do this? Oh, Chaos... I... I messed everything up... again..." Tears appeared in my eyes, she petted me again and I stared at her. "I'm not brainwashed or anything. I've always wondered what a guy feels like... even for a moment. Nack, do ya trust me?" My sister asked me.
I nodded and sniffed. "You know I wouldn't hurt ya on purpose or... force you to do this, right?" I nodded again, wiping away my tears. "... If... If I don't like it... can we stop? Or... will you... hate me?" I felt so weak, so powerless, so... vulnerable. With anyone else, I'd put up a fight, but when it comes to me and Nic? I turn into jelly.
I love her so much... and she's... all I have. She knows that too. I saw her shake her head and give me a gentle smile. "I wouldn't hate you. Let's just... test it and wait it out if this doesn't work, okay?" I nodded once again in agreement, I stared at her shaft. I stuck out my tongue and started licking it. This is what those girls on those dirty magazine and anime do right? I hope... I'm not fucking this up.
I stared at her and saw her smile, and gave a low groan. "Ohh, yeah... that's a good boy. Keep licking, Nack." Nic rubbed her hand on my head, petting me and praising me. I closed my eyes and blushed. Hearing her say that I'm doing good... makes me so, so happy. I trailed my tongue across her shaft and started suckling her balls.
Nic gasped and shuddered, I concentrated on pleasing her while she groaned some more. "Ohh, Nack... you're doing so good. Your tongue feels so good, and-ah! Ohhh... You're such a good brother." Nic said to me, my cheeks were bright red. I stopped and saw a bit of precum leaking out, without thinking, I started to jerk myself off and take the head of Nic's cock into my mouth.
I slowly bobbed my head as I heard my sister moan. I then went deeper and my eyes widened, it touched the back of my throat and I started coughing and choking, Nic stopped and pulled me away. I took in some air and began coughing. "Are you okay? What happened?" She asked me. "I... I went too deep... Oh, Chaos.. I'm so sorry..."
She gave me a kiss on the lips and slipped her tongue, we both began to make out as we hugged each other. The kiss lasted for ten seconds before breaking for air. "I think we're prepared enough for the main course. You give a mean blowjob, Nack. Sure you're not gay?" I blushed and looked away. "I... don't think so? I dunno... main course for what?" I asked, feeling like an idiot.
"Alright, sit down and spread your legs. I'll do all the work." I did what she asked and held my legs apart, my cock was twitching and leaking pre, I was edging away from cumming. Nic positioned her dick at my entrance, I shuddered as it brushed against it. "I'll bet you fantasized being taken by a cock. After all, you do hang out with Bark and Bean a lot." She said.
I blushed, it was true that I hung out with them as Team Hooligan, but... was that the case? Was I gay and just... ignored it? I didn't know. The tip started to squeeze in until it went in my ass with a loud pop! My eyes grew eyed and gritted my teeth, my body shuddering a little as Nic held my waist and rubbed me gently.
"Does it hurt?" I nodded slowly. "A... a little... fuck... I must be so pathetic... The usually proud and... mmhf... p-prideful Fang the Sniper... r-reduced... to this. I'm such a pussy..." I said, frowning and blushing, embarrassed of myself. Face it, I was a complete joke. Even when I was hired by Eggman, I screwed up due to my incompetence. Have I... really grown at all?
"You were still new, Nack. And besides... I think your cute this way. Just sayin'." My sister said, a small blush on her cheeks as I stared at her in surprise, completely ignoring the pain I felt earlier. "I... I'm ready. But... please go slow? I-I'm... st-still a virgin... *sniff*" Fuck... was I gonna cry again? God damnit... why am I always like this?
I felt her thrusts in my ass as I gave out grunts and groans, tears ran down my cheeks as I just took her cock. It feels so big and thick... mmhf... Chaos, this feels amazing. "Mmh... your ass is so tight... I bet my cock feels good, doesn't it Nack?" Shit, she's right. She saw right through me, I gave out a moan and felt a little bit of pleasure coursing through my body.
"Aahh... N-Nic... y-your dick... ohhh..." Nic held my legs apart as I felt my hands getting tired just holding them, I closed my eyes and moaned. Her cock rubbing and scrapping inside my anus. Dear, Chaos... this feels way too good. Why haven't I done this sooner? I opened my eyes and stared at her, giving her a pleading look.
"M-more... it feels good, Nic... C-can you... ahn... g-go faster?" Nic smiled at me and quickened her pace, I groaned louder and started to smile back. Fuck, this feels so good... "F-fuuuuck... This feels... s-so goooood...~ Oh, Nic..." I heard Nic chuckling at me, her thrusts never stopping. "You look so cute, begging and being so happy for my dick." Nic said to me.
It was true. It felt way too good. I wanted more. Her cock feels so good inside my ass. And, ah! Th-that spot! It made my eyes widened and gave a loud groan, my tongue lolling out and a deep blush on my cheeks. "Y-yes! Gimme more dick! Let me have your cum, Nic! Oh, Chaos!" She went deeper as I wrapped my legs around her waist, wanting her dick to stay deep inside of me.
"I-I'm gonna...! Oh, fuck... I'm gonna cum!" I let out a groan as I came on my chest and face, my sister never stopped fucking me. But I could feel something... "I'm... getting close...! I'm gonna cum, Nack!" I heard her, gritting her teeth, I threw my head back and my eyes rolled back. I let out a cry and felt Nic filling me with her warm cum.
"N-Nic...~ That was... amazing..." I said, catching my breath. She pulled out of me, her cock dripping with her seed. "Wow... I made a mess with ya. How about a shower?" She asked me, I nodded and Nic helped me to the bathroom. My legs still shaky from that experience. But we didn't stop there, oh no.
Even in the shower, we hugged and kissed each other, rubbing our cocks one another. I don't know, but it felt good. "Mhh...  Sis..." I whispered softly, my breath hitched as she began stroking my cock. "Still horny? Me too. How about we take this... somewhere more comfortable?" She said, with lust in her voice. I blushed and agreed.
It was late at night as I began riding Nic's cock in her bedroom. I was moaning and panting like crazy. Fuck, this feels so good! I must have blew my load three times before we switched. I was pounding Nic's asshole as she stroked herself, we began kissing each other again. "I love you... ah... s-so much, Nic... Oh, fuck..."
"Me too... I'm gonna cum again...!" We both groaned as she came on herself and I blew my load inside her anus. Man, we should've done this ages ago! After what seemed like hours, we were cuddling each other as the two of us were catching our breaths. "Hahh... w-wow... didn't know you could moan so much, Nack." Nic said to me, I closed my eyes and smiled.
"It felt... amazing... I don't even care if it was gay or not. I felt... so happy." I said, I snuggled up closer to my sister's breasts and sighed. "Hey, Nack?" I opened my eye and stared at her. "What if I invited Bark and Bean to have some fun? Is that alright with ya?" I blushed a deep red and nodded. "... Okay, but... can we do that later? My ass hurts... you were so rough."
She gave me a kiss on the forehead and rubbed my back affectionately. "Sorry. Oh? Looks like the potion wore off. Back to being regular me, again. Disappointed?" I shook my head and kissed her cheek. "Never. Just... don't leave me. I wanna stay like this." We both closed our eyes and soon fell to sleep. I was already looking forward to seeing my old teammates expressions. I fell asleep with a quiet chuckle and a smile on my face.
END