5. are you going to add a mod for amy and sally to be the babysitter, to have lesbian scenes?
You have
no idea how much extra work would be involved in something like that -- not only would nearly every scene have to be rewritten to accommodate that, and nearly every piece of art have to be redone, but it would exponentially complicate the programming code because there would be
hundreds of places in the code where you'd have to constantly check to see which character the player had chosen to be the babysitter and make sure you swapped in the right pronouns and branched to the right version of the scene and used the right artwork.
So, no, I'm afraid this is one place in which I am putting an immovable stake in the ground. There will be
no modifications or additions to the game which involve changing the entire premise like that. That's not to say there might not be some hentai scenes in which Amy or Sally have more of a role than they do now, but there will
not be an "Amy Babysits Cream" or "Sally Babysits Cream" option. (Nor will there be "Tails Babysits Cream", "Cream Babysits Tails", "Cream Babysits Sonic After Dr. Eggman Zaps Him With The Infanto Ray And Turns Him Into A Toddler", et cetera, et cetera.)
(At least,
I am not going to be the one to do it. If someone else out there is feeling particularly ambitious and/or masochistic, and wants to take on the task of forking the existing code and completely re-doing the game along those lines... hey, knock yourself out.)
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1. In addition to correcting the various texts, will you also replace the old images? (hentai scenes and wallpapers)
Some of the images might get changed or updated, but I see no reason to completely replace all of them, no.
2. In addition to completing this game you also want to extend it by creating for example more endings than originally (if I remember correctly in the past there were only two endings)
Probably, but I haven't made any firm plans on that yet.
3. You will modify or add parts for secondary characters such as Cream and Sally (If I remember correctly in the old version Sonic was also the bebysitter of Tails)
3b. if I remember correctly and there was also a part of the story with Tails will you also create hentai scenes involving Tails? (it would not be bad)
Amy and Sally will
probably have some additional scenes at some point, and the ones they have now will definitely be rewritten and expanded on.
As for Tails, those scenes are going to be
heavily rewritten and revised. The stuff Avalon put in the original game, with Sonic's abusive behavior towards his supposedly-best-buddy, is a steaming pile of hot garbage, IMO, and all of that is going away as soon as I get to that point.
4. In addition to the standard (hentai) images, will you also add animations? (if I remember correctly the old swing scene was animated)
I don't remember
any of the scenes being animated, personally... Ren'Py doesn't support animated GIFs, so animating the scenes isn't quite as simple as you'd think. So, no, animation is not currently on the roadmap.