For your breakthrough in this battle vs. lust, you may consider the following:
1. Delete all files of lust and deception files in your mind such as lustful memories of your past.
2. Identify all possible entry points of lust in your life and destroy them, i.e. printed materials, porn sites, gift items, objects, paraphernalia, etc.
3. Get connected with God and dwell in His Presence. There you make covenants with God where His Spirit will put his law on your mind and write them in your heart, i.e. Lust is not pleasurable; holiness is pleasurable. Lust is not enjoyable; holiness is...and so on.
4. Once you have deleted all files of lust and destroyed their possible entry points, lustful demons cannot activate your body into lustful fantasies or exploits because when your spirit and body sense them, your feelings will identify their filthy presence so you may experience filthy sensation, stomach ache, loose bowel movement, etc.
5. After having gone thru this warfare process, the lustful demons will quickly flee from your midst or environment or target location upon identifying them and their access, entry, or contact points.

Increase your truth files vs. lust. You will not be vulnerable to lust anymore even when you step into their territory or get contaminated by people infected with lust.

Leo