"Well, since I have one now, I might as well take it for a test drive," she said to herself sexily. It was time to put her new penis to use.
There was a tightness in her new member as extra blood flowed into it and started to stretch it out, almost like inflating a balloon. Claire grinned watching her masculine crotch becoming erect for the first time. It was doubly arousing to watch and feel this happen in such stark contrast to her otherwise feminine body. At first, her penis got thicker and longer but remained soft. After it was longer than the width of her hand, she grabbed onto it and shook it gently, giggling a little bit at the feeling of it flopping around in front of her. Touching it sped up her erection even more, causing her member to stiffen up and remain rigid. She played around a little bit with the glans and the piss slit at the end of it, always having wondered what it felt like for a guy to do that!
Before long, Claire was jerking off just like a horny man might, gripping her pleasure pole in one hand and sliding the skin up and down along her own shaft, milking sexual pleasure out of her crotch extension as urgently as she might guzzle water from a glass on a hot summer day. Claire definitely had a head start in learning how to masturbate as a male because she had seen guys do it in her porn videos and she had teased some of her boyfriend's dongles as foreplay during sex. She'd never told any of her guy partners that she secretly wished she could do this to herself. But now she was really doing it!
Less than a minute into her carnal act, it became clear she was milking a lot more than just pleasure out of her new addition. There was almost a steady stream of precum spilling out of her erect cock and stickying up her hand. The notion that she was seconds or at most minutes away from creating actual semen gratified her and enticed her to pick up speed. The inside of her groin kept clenching up and relaxing as though it were getting ready something.
Just as her hand was starting to cramp and she was starting to wonder if she would have to put this off for later, another wave of pleasure crested over her minutes-old dick and then startled her by washing over her whole body like a tsunami. She felt the warm wetness of fluid building up inside her near the base of her penis while she was involuntarily forced to hold it all in like a dam. Then the dam broke: a muscle relaxed in her groin like she was going to the bathroom before it suddenly tightened up again, leaking out a quick burst of fluid and squeezing it up into her cock. Then it happened again, and again, and again! Feeling those pounding surges of water pressure getting shoved through her erect penis made her feel strong and virile, practically erasing the dysphoria she had about her female genitals before she found the book. Watching those fountain-like eruptions of white liquid squirting out onto the toilet, the walls and floor also gave her a new appreciation for just how hard it was to aim or try to control the liquids that come out of penis! Cleaning up after herself would have to wait until this was over, though. She was going to ride this orgasmic roller coaster until it stopped.
Finally, after what felt like minutes but was really only seconds after she started ejaculating, her fountain slowed to a trickle, and she was left squeezing out a few last gobs of stinky fluid out of her softening penis. She looked at the sticky white mess in her hand, marveling at the invisible tadpole-like cells she imagined to be swimming around inside it. She could make sperm now! She didn't have egg cells anymore inside her; she could never get pregnant. But she could get stuff out of her penis that would make a baby.
"I guess there's a reason guy's call it the point of no return," she commented to herself after she caught her breath. She wiped off her member and tucked it back into her clothes before wiping off a few surfaces in the bathroom. Then she started humming to herself and walked out the door ready to try out more of life with her gender-bent body in the now-gender-bent society she had created using the book.