I felt like I was going to throw up. I couldn't help but look at the pamphlet, there was nothing else to do. Every time I did, though, it gave me a weird chill that I can only describe as "scarousal". That's a word I had come across on the internet a couple times, it's a combination of fear and sexual arousal. But there was nothing sexual about this. "There it is. Oh wow, it's packed." My sister commented as we pulled into the parking lot of a large medical facility. My stomach dropped as I realized everything I had been imagining over the last 40 minutes of driving would become much more real in the next hour. I looked down at the pamphlet again. "NCC Hands-on Biology" read the title. The acronym stood for Naperville Corrective Center. They are a for-profit institution that offers services in attenuating male behavior. Counseling, medications, and the worst one, surgical procedures. In an attempt to paint themselves as a public service they recently started offering educational experiences. They were advertised as a beneficial supplement to the regular psychology, sex-ed, and biology classes you take in school, even offering field trips under certain circumstances. Even though they were highly regarded by all the women around me, I couldn't help but feel uncomfortable with what they were teaching. In any case, none of that mattered now. As we walked in I looked around nervously. It was a nice building, I had to admit. Beautiful architecture, huge skylights, subtle touches of color from the paint, but it all still maintained an air of sterility and professionalism. My sister waved me over to the reception desk where she was already standing. "What can I help you with today, miss?" The receptionist asked politely. She was cheery, and admittedly pretty cute. "My brother and I are here for a field trip." "How exciting! What's the name on the appointment?" "Monica Bellemore. My mother scheduled it for us." "Monica... Bellemore..." the receptionist stared into her computer monitor. The countless appointments narrowed down with every keystroke. "Ah, here we are. Hands-on biology for 10:30. Thanks for showing up early, it makes things much easier for us." After a bit of typing she turned around an iPad on a stand. "Now I'm just going to need to get a couple signatures from you. This first one is to allow us to charge your insurance in the event that any medical care needs to be provided." Amber nodded and signed with her finger. "Perfect. This next one records that you understand the agenda for today. It can make certain people a little squeamish so remember that as the head of your group you have the ultimate authority whether to pause, continue, or end the experience at any point on behalf of yourself or the rest of your group, which in this case is just..." "My little brother." Amber chimed in as she signed again. "How fun! Taking part in an experience like this can build such a special bond between siblings. You two are going to have a wonderful time." I looked at Amber cautiously and she smirked back at me. The receptionist, noticing my hesitation turned towards me and said, "I know this can be intimidating for boys, but believe me you'll be so thankful you came. You're lucky that you get to share this moment with your own sister and not a group of classmates or coworkers like we often see here. It'll be something special between the two of you." She gently smiled before turning her attention back to Amber. "Now, you're all set to head in. You'll be in room 4B down that hall to your left. The signs should take you the rest of the way. If you get lost feel free to stop any of our staff. Have a lovely day!" "Okay, thank you" Amber politely waved back as we walked away. As we approached room 4B I turned to Amber, "Do we have to do this?" I pleaded uselessly. "Will you drop it already? You've been over this with Mom so many times. She paid for us to do this, and even if I think it's kind of lame and gross, we're still going to do it." Amber opened the door and we walked in. The door closed automatically behind us as we looked around the room. It was quite similar to your standard primary care room. Some counters with a sink, gloves, a stool, and in the middle of the room one of those medical tables with paper sheets draped over the top and a pillow towards the head. "I guess that's where you sit" Amber said, noticing the table. She took a seat in one of the small chairs in the corner. Usually there's only one or two of them but this room had maybe half a dozen. I sat down slowly on the end of the table, the paper crinkling beneath me as my weight settled. Amber was already on her phone but I was too nervous to do anything other than look around the room, analyzing every detail and what it could possibly imply for me. Soon enough we heard a knock on the door, which then opened with barely a pause. "Hello, you must be Amber." Amber set her phone down and stood up to greet the nurse. "Hi, yes I am." She replied, "And this is my brother." I sheepishly raised my hand to half-wave in acknowledgment. "Nice to meet you both. I just have a couple prep items for the both of you before we can begin. Now, I'm sure you all probably understand at this point what we're doing today but just to cover our bases let's go over it one more time." I winced. I've read about it a hundred times over the past week and discussed it privately with my Mom, but never yet in front of Amber, and certainly not with a complete stranger in the room. "First, Amber, we'll get you some gloves to put on. Then," the nurse turned to face me, "We'll get your clothes off and have you lay down on that table you're on." The scarousal came back in full force. My sister was attractive and I was aware of that but I never really thought of her sexually. She was too much of a pain in the ass to see her as anything else other than an annoyance. That said, the thought of having to take off my clothes in front of her and this nurse had me unquestionably excited. "Then once you're settled in, we'll begin the educational portion of this experience. Another nurse will come in and walk you through the scrotal incision as we separate the two halves of the skin. Then with a tray placed underneath, she will very gently unsheathe each testicle and rest them on the tray, careful not to damage the cords in any way. At this point you, Amber, will be allowed to inspect the testicles and cords. You can touch them, pull them, poke them, whatever you'd like so long as you treat them delicately and are careful not to twist them in any way. Manually instigated torsion will be a part of this experience but our nurse will do that herself in a way so that she will be able to easily undo the twists before any damage is incurred. She will show you the different parts of the testicles and what they do. Then once everything is over we'll stitch you back up and you both will be free to leave." Amber's face terrified me. Was she somehow starting to like this idea? "Will I be able to take any photos while they're out?" She asked. "Of course you can. Though you will have to change your gloves after handling your phone or camera to make sure you don't introduce any foreign bacteria to your brother's testicles. Does that all sound good?" I looked at Amber and then back at the nurse. "No. I don't want to do this. I don't want my sister handling my balls like that and I'm scared they'll get hurt." "Don't worry, honey. This experience is completely safe and you have nothing to worry about. We'll make sure your testicles are never exposed to any risk. Besides, I hardly think your sister would want anything bad to happen to them." "Of course not, you dummy. I know how much they mean to you." "Now ultimately, Amber, you have the final say on whether we proceed. You can stop this at any point." I looked at Amber solemnly, begging with my eyes not to go through with this. "I want to continue" She said. "Perfect, then let's begin! Would you like some privacy while you remove your clothes?" the nurse asked me. "No, he's fine." Amanda butted in. The nurse nodded and gestured at me to strip. I waited for Amanda and the nurse to start grabbing their gloves, and while they were turned away I started taking off my shirt. As the nurse turned around she remarked, "Oh, no need to take off your shirt. We really only need access to your lower half today." I paused, pulled my shirt back down and nervously started undoing my belt. Within a handful of seconds, though it felt much longer, my pants were on the floor and my hands grabbed the tops of my underwear. Amanda still faced the cabinets as she struggled to find a size of gloves that suited her. "Go on." the nurse urged. I lowered my underwear and placed them on my pants before handing them to the nurse who promptly set them on the counter. "There we are," she said. "See, it's really no big deal." Having finally settled on a pair of gloves, my sister turned around while she pulled them tight. As she looked up, her eyes stopped before they met mine. There was no doubt she was staring at my penis, which unfortunately for me was at full mast. She scoffed, clearly disgusted with my apparent arousal. I was so overwhelmed with embarrassment I hadn't even noticed the nurse kneeling down at crotch level. She took a piece of medical tape and secured my penis up towards my chest. Then standing up she said, "There we go. Can't have that getting in the way." She patted on the table behind me and I once again sat down on the edge. Then she held my torso and lowered my head down onto the pillow. While she continued her preparation I made eye contact with Amanda who had full view of my penis and balls as I lay there naked from the bottom down. I could have died in that moment, the embarrassment eating me away for what felt like an eternity. Suddenly I feel my chest tighten. "All set! Now you're not going anywhere." The nurse said proudly. I looked down to see a strap pulled tightly across my chest, and four more, one for each arm and leg. The nurse walked back over to the cabinet to replace her gloves. Seizing the opportunity, Amanda approached the table. She tugged on the straps, testing their strength. Satisfied, she leaned down over my chest and put her mouth up to my ears. Her top hung low and I could see her medium sized boobs hanging down in her bra. My penis hardened against my stomach. She whispered into my ear, "This is fun for you, is it?" She whispered slowly. "You like the thought of your sister seeing you naked? Seeing your testicles exposed? Becoming intimate with them in a way that not even you can? Well," she said, her hand reaching down and grabbing my balls in their sack. Giving them a tight squeeze she continued, "I'm going to make sure I enjoy this more than you do." Scaroused. Scaroused. What the fuck, why am I so turned on? Amanda gives my helpless ballsack one quick slap before standing back. I feel my vision fading. As I look to my right I see the nurse holding an IV in my arm. The last thing I see as my consciousness fades is my sister, smirking at me. She lifts her hand up to her face and makes a playful scissor gesture as my vision goes black. I'm now in her hands.