The latest Gore I've played/watched was Kowaku no Toki and a certain manga (don't remember the name) with an immortal maid who constantly gets sexually tortured by her master with different kind of tools to the point of even fuking a...ugh baby still inside the womb of the maid and then...ugh force extract the baby only to finally put it inside a...ugh mixer and...ugh....
Bit late for the reply, and dont know if anyones responded to this but...
Kowaku no Toki is one of the more f*cked uo hentai I've watched without a doubt.
The manga (hdoujin) youre talking about is Mai-chan's Daily life, by one of the masters of guro, Uziga Waita. Some other guro artist recommendations are:
Algolagnia (Quite amusing, almost parody)
Dolcett Archives, (western guro, cannablism, snuff)
Juan Gotoh (Couple of guro doujins)
Nanashi (The artist which is currently serialising Nagatoro, has a dark past on nhentai)
Kei-kun (Witches Final hour )