That's incredibly little money for any of those 3 things.
Busts come in at about $60 (American) nevermind full conceptual/feature artwork (especially showcasing multiple characters). For $25.00 (American) you could possibly get a fancy title card maybe with a simple mascot character included. (probably in a chibi/symplistic style)
Most commissionable writers charge around $10-$15 (American) per 1000 words. So for your $25 (Australian) You could maybe convince a writer to produce 2000 words. That's some intro there.
I don't know code but I do know its a lot more complicated than just having a parser. You need to plug scenes into the game which requires everything being linked together and then have a way for users to interface with the game so they can actually access content. Code is a constantly growing, evolving and time consuming beast.
Never call anything simple in coding, that's how you develop spaghetti.
You are trying to entice talented and/or experienced creatives and they need propper compensation for time spent working on your project.
All of the above is ignoring that there is no core to the game right now. It's literally nothing. What would the art be of? What's the introduction introducing us to? What's the point of a parser at this stage, the game might not even need one yet?
There's no plan for gameplay, setting, story, locations, how to handle smut, transformations, pairings, fetishes... The list just goes on.
There isn't even a concept here, just a vague (read: impossible) promise of the greatest smut game ever.
Yes there are wonderful people who are willing to create content for free as they do for TiTS. The important distinction is that they are producing content that they concepted or expanded and desire it to be a part of an expanding and enjoyable gameworld that is engaging and continues to develop. You cannot expect the same thing for a blank slate like this. Maybe one day when your deep into the process, but a lot of work needs to happen before that time comes along.
Yes I'm here to pile on and echo the rest of the thread but, I think reality needs to hit hard here.
(I debated posting this but... YOLO... Please don't shit on me too hard if my numbers are horribly off)