In the first one she gives you a full body paizuri to milk you for semen before she eats you whole. Spits saliva on you, and if you don't escape quickly enough it dissolves you into a red pudding which she eats/drinks.
Finally they have some lesbian 69 action at that point you are apparently already fully dissolved. While your upper body gets dissolved the other sisters gives you blow jobs until you die. One of them envelop your head with her vagina (which apparently leads to her stomach).
In the first one she cleans you with her breast milk and then eats you, in the second she sits on you, then shoves you into her asshole, and then uses a nearby rock as a dildo to shove you even deeper while she masturbates. She drives you insane with a pheromone overdose, then eats you through her mouth. She uses her spores to brainwash you into copulating with her several times, and in the end you grow into mushroom yourself?! Not sure what happens here. She eats you through her "bellybutton", similar to the extra scene in the first game.