Lolicon doujinshi

I'm looking for a doujinshi made by a artist on an old lolicon forum that closed down. Think his name started with an M.
Well the story in the doujinshi is that a dad and mom are like perverts and they have sex with there kids, one son and a daughter. The son is older then the daughter. I remember one thing from the doujinshi that might ring a bell in your head: The son draws a naked pic of his mom in art class and cums on it (in class) and the teacher says it's a good picture.

Edit: Age reference removed. You are not allowed to use age on LAH - Anyien

That sounds like Madoc`s[who is a she by the way] Her Own Room/Pennys Diary both of these you can find on wwoec forum and flatchan,heres the pg you mentioned