>number of witches in recent decades significantly decreased
>every existing witch with experience struggling to find an apprentice that would continue her magic and teachings
>enter MC
>a boring, average guy who has a part-time job in a clean-up crew/moving out service
>gets hired to clean out a witch's lair/mansion and prepare the witch's belongings before she leaves town
>the MC has always had a bit of a fascination in the occult and decides to fiddle around some trinkets and scrolls
>misreads and mishandles shit
>gets transformed into a woman
>the witch senses (s)he has a strong affinity towards magic and decides to take him/her as an apprentice
>the witch doesn't leave town and the MC has to quit the part-time job to become a full time with apprentice
>the apprenticeship is initially hard and harsh but the MC puts up with it because he wants to learn enough magic to turn back into a male and at least become a male sorcerer/warlock
>as (s)he gets better at magic his/her body (which was already really feminine post-transformation) gets more and more feminine with breasts, ass, thighs growing properly
>while all that is going on the witch also teaches him/her various methods of recovering mana/energy, one of those methods being sex
>the witch is pretty adamant that the MC uses sex as the main mana-recovery method because she hopes to probably mindbreak the MC into accepting his/her new female body and succeed her eventually (because of some implied rule that only witches can succeed witches)
>after a while the MC is a pretty capable witch (still an apprentice) with a really sexy feminine venus (not disgustingly fat) body
>got used to her female body and is experienced with sex but doesn't like doing it because she still hopes to find a spell that will turn her back, though most likely she is thinking about turning that out of habit

I don't have a lot of witch TG-related images so have this. Opinions on this setting?