Be milked of my sperm by a machine until im dry?

Iv had this fantasy for years, I have owned and currently own several automatic masturbation machines, from the Rends A10 cyclone to the Venus 2000 and lots of cheap telescoping/thrusting cups from amazon. I enjoy being tied down and immobilized as much as possible, gagged, then one of the devices placed on my penis and turned on leaving it to run until it forces me to ejaculate over and over until I am dry cumming, the whole time thrashing about and screaming into my gag from the hypersensitivity of being stimulated post orgasm. The feeling is unique as its painful but from the pleasure being magnified 1000 fold. It can take several hours depending on the refractory period, each time that ends and the normal pleasure begins I try to hold out as long as possible knowing the torture to come once I shoot again. By the end I am in tears, exhausted, and drained of all ejaculate.