Hi - this enchantment is quite a tricky one to get. If you've done
Scene with IT Guys at Night, or read the note about cleaning out your lockers and do a work out in your office clothes, then you can't get it any more, whether she works out topless or not.
A way to check is to go to this save editor -
You must be registered to see the links
- upload your save and look at
Variable#9. If this is 13 or more, you cannot get it. (If you really want to see the scene, let me know and I'll tell you the steps to get it from save 15
or you can view it by downloading the Ren'Py here)
It is not going to affect anything going forward - not doing it does not lock off any content - so just play on from where you are.