Michelle is a mechanic and can be found at the water cooler inside the driving school in Doherty, San Fierro.
While fighting a turf war normally there are 3 waves, ie you survive the first wave and then the second and when you survive the third "the hood is yours".
If you were on foot, just get into a car and you will automatically switch seats when she gets in.
Now Michelle will drive around while the camera is in cinematic mode.
She walked past me, thinking I was going to turn around and give her a kiss, take her out to dinner somewhere, maybe some dancing.... After "Key to her Heart" is completed, the Gimp Suit becomes available from CJ's wardrobe.
In San Andreas, they accept the possibility of "shit getting fucked up" and give you an out.