Stephanie dungeon solution spoiler below:
multiple solutions are available here's 2 i found both use electric wand. #2 is best in my opinion
1. use wand till she passes out then slap her awake three times (quickest win but miss a scene)
2. use wand till she passes out then slap her awake two times, electric wand her again but stop it before she passes out, open secret drawer on bottom right of desk and use cactus dildo and deny her to finish. enjoy
for victory scene
option 1 you win 2. she wins 3. you both win