Are they still steps without a patch or were they just changed to "roommates"? I added the patch some time back though I was okay with the step-sibling angle, I kind of forgot how it worked since I waited a few updates a while back.
No clue. All i can say is that the developer keeps changing initial placements of word or coding on the title page or something and they have to "fix" it each time. (If memory serves me correctly)
The two main characters are step-siblings who met each other as adults after their parents got married. This has been the original story since the first version of the game and the dev team has changed nothing about it since then.
The characters do call each other "brother" and "sister", but they are well aware that they aren't related and they aren't really doing anything illegal or wrong, they just don't want their parents to find out about it, because the MC's father is an asshole pretty much about everything.
This has been the original story since the beginning and nothing has changed about it. No patching is required so far to keep it this way.
The patch was made much later to change the
original story into something some people may prefer, but the game is not an incest game originally... Except for Patreon and maybe some really narrow-minded people. The story hasn't been written in a way to support real incest theme, so I'm guessing in some places some major re-writing is required in the script to change it.
I personally can't see any reason to change the original story, it's saucy enough for me the way it is.