Same here, only got relations with bella. So I am guessing you cant romance multiple sisters at the same time.
nah if you do it right you can have a harem with all the girls including Susan basically visit all of them before the end of every day
What about if you don't have "visit " option and it just says "sleep" and THAT'S ALL for that entire day?
Should be then yes.....check to see if you can find the guide I'm sure there is one, use it if your unsure