Access request session data of DetailView in CreateView in django

I am writing a library management system in Django. There are two views that I am having a bit of a struggle.

The BookDetailsView lists the details of a Book such as title, price, etc.

class BookDetailsView(LoginRequiredMixin, DetailView):
    model = Book
    template_name = 'book_detail.html'

    def get(self, request, *args, **kwargs):
        response = super().get(request, *args, **kwargs)
        request.session['book_pk'] = kwargs['pk']

        return response

    # used to mark book as read or unread
    def post(self, request, *args, **kwargs):
        if 'is_read' in request.POST:
            book = Book.objects.get(pk=kwargs['pk'])
            book.is_read = True
            book.save()
            return HttpResponseRedirect(self.request.path_info)

In the BookBorrowView, I display a form where the reader can borrow a book. Two fields are preset (borrowers and book), and I don't want the user to be able to change them. At the moment, the user can select among many options.

class BookBorrowView(LoginRequiredMixin, CreateView):
    model = BookBorrowTransaction
    template_name = 'book_borrow.html'
    fields = ['book', 'borrowers', 'date_borrowed', 'to_return', ]
    success_url = reverse_lazy('home')

    def get_initial(self):
        initial = super(BookBorrowView, self).get_initial()
        initial['borrowers'] = get_object_or_404(CustomUser, email=self.request.user.email)
        initial['book'] = get_object_or_404(Book, title=Book.objects.get(pk=self.request.session['book_pk']).title) # need the book id here
        print(self.request.GET)
        print(self.request.POST)
        print(self.request.session['book_pk'])

        return initial

The following is a screenshot of the form displayed by the BookBorrowView.

I have two questions:

1. I am passing the primary key for the book through request.session so I can access it in the BookBorrowView to preset the book's title in the form. Is this a good approach?

2. How can the two fields of the form be preset and unchanged by the user?

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