He becomes a powerful penis and makes his girlfriend cum so hard she faints! After reading an NTR doujinshi, he gets scared that his girlfriend might be taken by someone, so he starts penis training. After trying out various training methods and supplements, he transforms from a normal penis into a powerful penis with a huge penis, massive ejaculation, and insatiable sexual prowess! The protagonist is full of confidence, but when he takes off his pants to have sex with his girlfriend, she is shocked by his huge penis, and when he tells her why, she laughs. "Don't worry, I won't do it with anyone else. And I don't think it's good just because it's big lol" She says, but she never expected that he would make her understand and faint after seeing his powerful penis...