The machine tells him "step two, removing genitals tissue" the words alone made him nervous. That's it. He won't be a man anymore soon. No more jacking off, or peeing standing up, or putting his dick in anyone, not for six months at least.
The machine starts to jack him off. It feels like the best blow job ever. His heart pumps as he knows soon there won't be any more feeling like that. As his hard penis is surrounded by pleasure he tries to take as much in as possible before it's gone.
He feels a strange separation as the penis begins to detach from the skin around it. It feels for a momment like his penis is growing, but it's not, it's being brought into the machine and away from his body. Everything is going away at all once. Suddenly he can't feel it anymore. And it's so strange not to feel it, it feels like it should still be there but it isn't. His brain wants there to be a boner there but there just isn't. He feels the strange hole for a second where his penis used to be, and then it patches up with a bit of the skin as the rest it removed, and the empty space fills out with the same tissue that the rest of his crotch has, and the skin becomes the same as well. It's like nothing was ever there, just empty skin above his balls. He feels like he needs to cum but there's no hole anymore.
Suddenly he starts to feel what should be a climax but he feels a strange coldness below whee his penis used to be, and the machine opens up his scrotum, and exposes his balls to open air for the first time. There's no pain, perhaps there's almost pleasure, as his balls are removed. He just feels them one momment and then the next they're gone. The machine takes away most of his scrotum leaving the last of his male tissue gone. It patches him up as it did his penis, filling out the hole, and making the skin the same. He can feel how little there is between his legs, all so smooth.
"Final step: removing prostate and adding short uretha."
Suddenly he feels something prick him. It was around his pelvic area but further back than his genitals ever had been. He feels some sort of tube go into him, this strange, almost calming insert, that eventually hit his bladder and stopped. It was his new pee hole, further back than the old one so he could sit to pee. Just something practical, probably made from his old parts.
Suddenly he feels something else coming in around his anus, touching an extremely sensitive part and pulling it out his butt. It must have been his prostate. He begins to cum from the touch of it alone. Orgasmic fluid starts bursting out of his new pee hole, it's weird to feel, he's used to the feeling but not from that place, it feels wrong to have it so far back, and for it not to shoot out of his dick first. His brain was telling him it was coming out of one place while his mind told him something else.
But eventually the fluid stopped, as he could feel that the prostate was gone, the orgasm continued but it rushed throughout his entire body without any fluid or single point of sensation, a full body orgasm like girls had. But he wasn't a girl. He wasn't anything now. A slender androgynous body, with no facial hair, no penis, no balls, and no prostate. He really isn’t a man in any way anymore.