I've seen those endings, I mean an Ethan ending where he dumps the mother and stays with Ash
Hi again. Indeed, there are basically two different endings for Ethan/Monica.
One is:
"Mom was a slave to those (Ethan's) pleasures. She found freedom from her life, from herself, in them."
"And I shared some of those paradoxical feelings."
"Bathing in forbidden lust and taboos I felt I could shed any skin, any barriers I still imposed on myself."
"Follwing my mother's example, I became a woman capable of the most dirty behaviours."
"Ethan provided us with such enjoyment as a means to his own. Because he delighted himself with this way more than we did."
"Nothing exalted his depraved sense of arousal than having a mother and a daughter abandon all dignity and become his sexy toys."
Monica and Ash performing at the Wheel.
And it ends with:
"They (Ethan & Monica) lived happily in their corrupted version of a fairytale."
The other one is:
"But all dreams come to an end when you wake up."
"After a couple of years, he dumped her."
"He had Mom eating out of his hand, she was completely devoted to him. Yet, of course, he ended up getting bored of her."
"When he found a younger, hotter woman to corrupt and play his games with, he kicked Mom out of his place."
"She ended up with one of Ethan's so-called \"friends\"."
"He was fat and unattractive, and considerably less wealthy than Ethan, but he could still provide Mom with a comfortable and somewhat luxurious lifestlye."
"He was more than willing to take her in, as he had always coveted Ethan's woman and plaything. One of those guys who are happy to shove their face into their betters' leftovers."
"Mom never loved him in the slightest, nor let go of her resentment for Ethan, to the man she had given everything to, even sacrificed her family for."
"The bitterness of having been used and discarded by him never left her, and she became one of those bitchy and unhappy women, clinging to her fading sex-appeal to feel worthy."
"Being around her wasn't very nice, of course, and I ended up avoiding her as much as I could."
"She had her new husband to take care of her, after all."
There's no hint that Ash becomes Ethan's gf after he had abandoned Monica. The "younger, hotter woman" mentioned surely isn't Ashley. It seems to me that Ash never had sexual contact with Ethan except that scene in the 'Wheel' where she may give him a handjob. Enjoy