Nice

How to make the decision making feature something that doesn't break the flow of the story?

You could try doing it Dragon's Lair style.

1) The story segment provides "clues" to the options at the upcoming choice, ex: SMF is running down the street, chased by a supersized PMS. we get an over-the-head shot looking down the street. a storefront door on the left flashes, as does an alley entrance on the right, and a bit of the road further down the street than both.

2) There is an on-screen countdown timer showing the window when the choice can be made, it can be the same style throughout, or vary based on the environment. ex: a shrinking green "progress bar" at the bottom of the screen, or SMF's face turning blue as she holds her breath underwater, waiting for your choice.

3) One of the choices will be set as the 'default' if no valid input is received before time runs out. ex: in the running down the street scene, continuing straight would be the default.

And Dragon's Lair was actually one of the first interactive games for the early DVD player, the controls mapped pretty well, as the DVD remote had four directional arrows and an OK button for 'Sword.'

Not saying you should dive back into the interactive DVD right away, just offering some inspiration and insight. Speaking of insight:

1a) the number of options should be kept small at each branch to keep from confusing the player (and overworking the animator), 2-3 choices should be the norm (set gun to Grow or Shrink) (Dive into the shop on the left, the alley on the right, or keep fleeing straight). 4-5 choices should be rare (aim the gun as PMS's chest (OK)[default] head (UP) hips/ass (DN) the prof hiding behind the bush (Left) or the car mirror, where SMF can see her own face/ aim the shot at yourself (right))

I used to play Dragon's Lair in the arcade (yes, I'm that old). The problem isn't so much decision making on my part. It's more that the viewer's attention is deciding what to do rather than enjoying the cartoon. After trying it, I found that it gets as annoying as commercial interruptions during a movie.

So you get to choose different endings? How big SMF gets?

That was one idea. There would be death or dead end scenes where you would have to go back a scene or two and try again. Sort of like Dragon's Lair or Space Ace. Instead of tapping a joystick or pushing a button at the exact moment, the scene would pause you would be given text options. The following scene is dictated by your choice. The choices add up and because of that, the amount of scenes required would be massive.

I'd make her feet so MASSIVE her toes would be like blimps, and her teets would GROW so HUGE they'd pop her poor top, and somehow that would be how she saved the day. 🎈🎈👣

One of many endless possibilities.

i would make her really fat because i haven't seen you do that before.

a physical dvd of SMF?? heck yeah id buy that!