Long-term Solo Sex While Tied by a Piston Machine

"A wonderful machine that will endlessly thrust into my genitals." A gift from a male friend. It was a dildo piston machine. Today was the first time I used it, and I unexpectedly ended up having a long experience. - Handcuff play - Approximately 60 minutes of solo sex with an electric piston machine With my hands cuffed, I leaned my upper body on the sofa and inserted the dildo while kneeling. The piston machine slowly and continuously thrust deep into my genitals. At first it felt good. But as time went on, I was experiencing repeated orgasms.