I have already done it
Get some strong health,Lust,and restrain potion
Ask othra for cleasing water (i think you can get it before beating roushk)
If got any effect use cleasing water
If got any damage or Lust use Health potion for damage and Restrain potion
Kill the aco first
Use Lust potion (strong till he lose)
Remember must use The "strong" potion for more effective