Regret what? That instead of rotten sex with a small dick, she chose high-quality sex satisfying Asuna's lust? Or will she regret betraying a loved one because of high-quality sex with another? In the case of drug addicts, do you know which addiction is stronger - psychological or physical? Fujino is exactly what the game is about. Lust conquers love. Therefore, Kirito no longer needs such an Asuna. He won't regret it, it doesn't matter anymore.
It is clear that despite the fact that this is NTR, people want some kind of satisfaction of a sense of justice at the end of the game. But the fact that Asuna will regret something is a placebo. She's already a cheating whore. And it won't change anything. So a good ending is Kirito accepting Suguhu, and maybe Sinon will help them to beat the council.
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