She knows nothing

 She has no idea that she is being filmed. It has become a little thing for me to secretly film. 

Perhaps not so kindly done to her. Only me and a friend of mine got to see the videos because he secretly filmed himself having sex with his wife which he showed me.

Since I don't have a partner, I often met the girls out on the town, but it happened that I filmed some girls who were my acquaintances.