If You Can't Get Hard, Let Me Make You Pant: A Sadistic Playboy's Godlike Technique summary:

Yota, a college student, had an earnest request... To cure his ED and enjoy campus life. Watching a po** video during class, hoping things might change if the situation were different, he was approached by Ren, a well-known playboy!! He said, "I jerk off to stuff like that a lot, too. I love it." When Yota opened up to him about his worries without realizing it, Ren started touching Yota, saying, "How about I beat you off?" As Ren made him feel good with his experienced, godlike technique, before Yota knew it, he started getting hard down there...!?