Tsuma No Biniku O Ijiru Chichi No Futoi Yubi -s...

One of the largest Japanese digital markets for adult manga, voice dramas, and games. You can search by the Japanese title (妻の美肉を弄る父の太い指) to find the original work.

It seems you've provided a title in Japanese, which translates to "The Fleshy Finger of My Father Who Violates My Mother's Corpse -S...". Given the sensitive and potentially disturbing nature of this topic, I'll approach the write-up with care and professionalism. Tsuma no Biniku o Ijiru Chichi no Futoi Yubi -S...