This is a completely fictitious story, everyone involved is over 18, none of the characters are intentionally based on real people. Except me, and even then I'm fantasy-ized. ;)
A couple of days later I was back at it in the same shower, I left the curtain open a little as I get off on others seeing me. I wasn't in the shower for more than three minutes when the same black guy from a couple days ago walked past slowly, glancing in. Then he walked back the other way practically stopping, I could see he was completely naked, huge cock swinging as he moved. On his third pass he had his huge cock in hand, balls swinging and pulled the curtain back a bit more while watching me. My heart was pounding and I was getting pretty close, so I motioned for him to join me so we didn't get caught.
He stepped in and turned sideways so we were facing each other. We stood there jerking off for a few seconds before he reached over and started to rub my balls between his fingers, I stopped jerking off because I was so close. He held my balls like that for a few seconds before he stopped jerking himself off and took one of my testicles in each hand. He massaged them by running his thumbs over the tops, pressing down into them as he did so, his thumbs sinking in about a half inch, which felt great. He stopped after a couple minutes and used his left hand to bounce my balls while he used his right hand to slowly jerk me off. He then stopped bouncing my balls and would gently squeeze and release them. While he was doing that I reached out and started to stroke his cock. It was massive, standing like we were if I held it straight out it would bump into the bottom of my balls. He set my balls back down against my thighs and took his cock back from me so I started to jerk myself off again.
After a minute or so he swung his cock up into my balls with a meaty slap, which made me grunt but it wasn't super hard, and I was close so it just kinda turned me on even more. He kept jerking himself off and he'd slap his cock into my balls every few strokes. My balls lifted and my breathing sped up as I neared orgasm, he grabbed my wrists and held my arms over my head so I couldn't keep jerking off. My load just kinda poured out of my cock and dripped onto his, it was weird and very unsatisfying. As I continued to dribble cum onto his dick, he leaned in with a grin and quietly said, "name's Dre."
Dre didn't release me until my cock was almost completely flaccid. I tried to continue jerking off, but I was soft and even though I had came, I was still super horny. I looked up at him and he just smirked while he slowly smeared my cum over his cock. I wasn't sure what to do, so I started to get out of the shower but just then a couple of guys walked into the locker room, so I jumped back in before they saw me. My heart was pounding and I was instantly hard again having almost been caught. I looked back at Dre, who grinned at me and shut off the shower. The two guys were talking a bit as they changed, so I stepped back out and grabbed my towel.
As I started to towel off, Dre started jerking off so you could hear his hands squelching over his cock covered in my cum, his balls slapping against his thighs. The two guys instantly stopped talking. Here I was, as hard as I can be, standing there in the open. I kept drying off, hoping if they stepped around the lockers they'd see it wasn't me pounding one out. As I bent over to dry my legs, they both stepped around the corner in just briefs and stared at me. Both glanced down at my erection just as Dre reached between my legs, grabbed me by my cock and pulled it backwards pointing it at the floor. He jerked me off super fast and hard, slamming his slick hand into my kinda squished balls. And I blew. Right there with those guys watching wide eyed.
As I started to come to my senses, I looked down and saw Dre's other hand under my cock, full of my sperm which had filled his hand and was dripping onto the floor. He was still jerking me off, which was sending what felt like electric pulses down the length of my dick. Then he pushed my cock forward without letting go, forcing me to awkwardly step forward as he stepped out of the shower. He dropped my cock, straightened up and told those guys, "I needed more lube."