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I'm looking for this one doujin that I cannot remember.
It starts out in an alleyway with three delinquent girls bullying a kid with a small dick. Than one of the girls goes back to her cutesy room thinking about his dick. She goes to school the next day seeing him on the rooftop. Her friends show up after her and they were going to bully him again, but she tells them to go away. She wants to see the kid masturbate, and his small dick suddenly becomes huge, confusing the girl. He accidentally cums on the girl and she proceeds to punish him by having him penetrate her, making her not a virgin. They have some sex and cum. The final pages show them dating and she asks for his thing, he takes out his wallet, than his dick. The girl was actually wanting to hold his hand and that's the end.

First page looks something like this.