That's my audience which I have built over the years: Canon but with no cockblocking (Sudden heroine interrupting the other), actual relationship (no overly oblivious MC), and of course sex (Which canon doesn't have). Just by including relationships the plot does shift towards other directions (Such as with Legacy of Hestia), in other cases I simply include those alternative scenarios by putting choices, so you can follow the canon OR do something differently (Such as Overlord H).
With Vox Gremory, I want to do something similar to Overlord H, so following the canon while adding choices that shift the main story towards another direction. Up to R6, I've already included quite many custom scenes that aren't part of the canon, and even added an important choice regarding Raynare, she'll get her own episode too which goes in depth with MC's trauma before it's "fixed".
However, in the near future I'll be making a companion game (Smaller scale, single heroine) for either Grayfia or Venelana (I'll be making a poll to let patrons decide in a week or two), that one won't be following any canon.