 If you liked
Eroman: Kami to Pen to Sex to!!
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 ...then you might like
Jikyuu Jisoku de Nani ga Warui!
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it's about two pent up doujinshi artists, who start having sex with each other. while it's not exactly the main focus in Jikyuu Jisoku de Nani ga Warui, in both series the characters use their sexual experiences as a reference for drawing their manga. both are very smutty.