Hi,
Yes, wake-up sex is the topic of a future update (not the one dropping on the 20.08, the next one after that) but don't get too accustomed as the game revolves mainly around mc raping the girl in her sleep and recording it.
To balance the night fun, dev is constantly adding some daylight sex scenes that are consensual.
As for your other question, yes other girls will be added as potential MC's victims as well, though not every girl will be available for night fun, rather some daylight sex events.
Cheers