I'm glad I didn't skip this. Don't judge a book by its cover. The art is subpar, but Izumi is still cute. And the teasing is really hot.
Anyway, here's the rundown. He gets caught stealing a glance at some girls on the train, and ends up paying 30,000 yen as settlement. But because they're so nice, the girls give him a handjob for 20,000 yen at a karaoke booth. They meet again a week later, and he wants a handjob for 10,000 yen because he's strapped for cash. This is the fun part. Because he didn't pay the full price, Izumi stops before he can finish. He begs her to continue, so she restarts for 5,000 yen. Then she stops again until he desperately pays 5,000 yen more. All right, he's there now. He braces for a big one, except she lets go again. He comes, but it's weak and dry. The girls leave, and he doesn't get to properly climax.