Permission to Masturbate

My boyfriend and I were dirty texting and things were getting pretty intense. At the end of the conversation I was turned on and was planning on masturbating. However he texted me and told me I do not have permission to masturbate and that I had to wait for him to basically make me orgasm until we were together today. Quick google search brings up things like Christian Grey and 50 Shades type stuff. Can anyone explain this desire to control when I masturbate? It was kinda hot he said that, but left me wondering as no guy had ever said that me before. any insight? Thoughts?