My understanding is that he had consensual sex with them, they went to sleep, then he had nonconsensual sex with them while they were sleeping. They were individually disturbed by these events, but did not decide to file charges until they compared stories.

That's very different from "the sex became nonconsensual retroactively". And I don't think it's uncommon for women brave the consequences of speaking out about sexual assault when they believe there's a pattern of behavior they can protect other women from.