Kyokugen GanguNo one has written a description for this one... But if you write one I'll add it both here and in Manga-Updates.
Titles: Kyokugen Gangu, Ultimate Limit Toy
Mangaka: Psycho (story and art)
Categories: Gangbang, Rape, Large Breast, Anal Sex, Double Penetration, Lolicon (last chapter)
Length: 1 volume