Fucking Machine Goes Berserk, Cum Extraction Turns into Ball Torture! Making the Long-Lost Uncle Slave the Test Subject, Full Record of the Training Session Filled with Mishaps

I recently got hooked on 3D printing, started using modeling software to create my own toys, including training toys. I modified the sex machine into an automatic cum extraction machine that can install a fleshlight, designed a test version of a fleshlight adapter ring, and shared it on Instagram stories. A long-lost uncle slave saw it and asked what it was, so I took the opportunity to ask if he was willing to be a guinea pig, thus leading to this training session.

During the training, it was interrupted several times, including the fleshlight slipping out of the adapter ring, the sex machine constantly making jamming sounds, and even because the sex machine was running too fast, causing the fleshlight rim to hit the slave's balls, turning from cum control to painful abuse in a funny interlude. Fortunately, the uncle and I have a deep relationship and were happy to continue being the test subject. Afterwards, he provided many practical suggestions, allowing this adapter ring to continue iterative updates, believing that his next visit's experience will be completely different.