Stop stroking
And listen. This part was very new to me, Rachel had my arms held behind my back, Mistress Nadia put just enough pressure around my neck to where I was completely in her control. She then started to slap my breast. The first 5 or ten were extremely painful but then, for some reason, they started to feel good. Very good. I still screamed with every slap, but then I started to yearn to furiously rub my clit.
Give your cock 5 good backhand and forehand slaps so you get the picture