I'm just about through with my current list of commissions. Instead of a first-come, first-serve system that caps off after a few people have shown interest, I've decided I'll be permanently 'open' for commissions, and whenever I have the time I'll get in touch with interested parties and get their stories written. Feel free to inquire at any time!
My rates: $7 per ~1000 words, which is roughly 3 pages using my more recent.pdf formatting. sicstories.deviantart.com/art/... , for example, would be a $7 story. This covers time spent writing, proofreading, commissioner suggested changes, and any research that needs to be done to convincingly depict the characters and setting! I will always make an effort to provide previews and receive feedback from my commissioners before requesting payment.
As for content, I tend to write weight gain and transformation the most, but other topics can most certainly be discussed! I'm familiar with a wide range of video games, film, animation, and literature. If you're not precisely sure where you'd want a commissioned story to go, or just have a vague concept you want to see put to paper, I'd be happy to spitball with you.
If interested, please shoot me a note!