You think about the cute girl in the train, her slender legs and soft lips. Immediately your cock springs to life. Yes! It still works just fine.
Excited about the good news you don't lose time and start to jerk off furiously. You instictively rub the patch skin where your balls supposed to be, and almost moaned, the area is so sensitive that is as if you were rubbing the lubbed up head of your shaft. In less then 3 minutes you're cumming in large ammounts.
You are happy that you're still able to cum, but the fluid is transparent and most likely has no semen at all. You fall asleep with your sticky fingers, still in bliss.
In the next day you rush to the bathroom, desperate to pee. Only after you alleviate yourself and go back to your room you realized how easy it went. You didn't have a morning wood!
You turn on your computer after a porn folder, just to be sure everything still works. You take your time watching a few short clips, it takes a bit of effort but you get it up, maybe you're just nervous. You realize that playing with that soft patch of skin under your dick helped a lot.
Since it's a lazy a sunday anyway you decide to spend the day at home jerking off and experimenting with you new sensations. But you realize that after each time you cum your cock gets softer and it is harder to get it up. You've spent all your testosterone and you're not producing anymore!
You decide to hit Mia up on her phone just so you know when she intends to return your balls.
She doesn't pick the phone up, but she replies in text after 15 minutes.
"Hey! I've just checked with my personal trainer, my progress is amazing! Swap you back at the end of the month! XO"
Shit! A whole month? It was supposed to be a few days tops. What are you going to do now?