The Creamy Volcano
When a guy has anal sex with a girl and cums in her anal cavity then afterwards he presses firmly on her a-hole so the jizz shoots out. Then the girl scoops the jizz wad up in her hand and proceeds to finger herself back in the ass with the man cream making it bubble up.
Your dad kept complaining that your moms fingers looked crusty and had a bad odor. Must be becuase he was up all night giving her the creamy volcano.