If you are looking for a good laugh (and you like the dirty jokes a lot) – try reading the manga called Imouto Wa Shishunki. It has a brother – sister type of perverted theme but there is nothing dramatic about it.
I have selected the best bits that got me giggling. You can see the entire series on MangaFox: http://mangafox.me/manga/imouto_wa_shishunki/
Read from Right to Left, Down first then left.