I'm interested in stories where the MC can make physical changes to his/her own body and/or changes to other peoples' bodies. To give an example, in Puzzle Box Genie, the MC gains the ability to modify his own body such as changing his cock size to better fit his partner. He also gains the ability to modify others such as changing their breast size, adding lactation, making their throat more able to take his dick, among others. I'd rather see stories where the MC can make those changes on the fly whenever he/she wants as opposed to those where there is only a single change like where he/she gets a better body.
I originally found an author elsewhere that has written a few stories along these lines that got me interested in this topic. He/she isn't writing any more for the time being, but I'm hoping to find other stories like this.
I posted this in the wrong forum at first and somebody mentioned the masterpc stories. While those sort of fit what I want, I'm thinking more of the person actually has the ability rather than using a tool like a computer. It did remind me of the series of stories where the MC has the same abilities of the masterpc program but turns out to be a mage (or something).
Thanks