Did you choose me slut? No? It's ok I'll forgive you, after five smacks to those traitorous balls!
Now, I want you to find the perfect picture of your perfect shemale, a photo that best shows why you want to serve her cock, so of course it show her cock.
Then I want you to save that photo to your phone, you don't have to set it as your background, but make sure you can look at it if you need to. Now, tomorrow you will at three points in the day, look at that photo and get an erection. That is all, you do not need to jerk off, it does not have to be in front of people, you can go to the bathroom if you like.
But you must look at it and get hard three times.