I have reviewed your requirement and i have a big site bible for all article with page wise and there was almost 3 million records, important is not how much data , important is response time of the scraping site time.
Anyway, I have 9 years of experience in PHP, Codeigniter, Yii and MySql database design, before going to award me kindly ping on chat, that i can review the dult site that i can know what and where i have to grab.
"Please ping me on chat and mention you comfortable time to discuss the task list.
I will give you 6 month free support after finish the application."