A sex demon? Really?
Now, to the problem.Ember, sage your place to keep this thing from you, Smudge him out. Then salt any openings; doors, windows. Then a personal protection. Now you can help your friend the same way. Do yours first, as it sounds like it might not be liking what you're doing. Smudge with sage then the protection to keep it out. I'm wishing you luck and success. Blessed Be...