Funny fantasy here
Will it ever be as tight as it was when she was still in High School and a virgin? No, it does get looser, but hardly "that" loose..
That a big cock (or multiple) can stretch it out so much, that it will stay stretched is just ridiculous. Even a fist for that matter. Unless you do it like close to 24/7 and it never has time without something stretching to recover.
'Cause if it were like that, every woman who has ever given birth, would have a pussy so loose that you can't even immagine.
In comparison to a Newborn, any cock or fist is small. And still we return normal.