I position myself behind you and line my cock up with your tight little hole. With a gentle push, I begin to slide inside you. The head pops in easily enough, but then it hits the tight muscles of your sphincter and I pause for a moment to give them time to adjust.
You let out a sharp breath as I slowly push past the resistance, feeling my length stretching you more with each inch that disappears inside. Finally, I'm all the way in, buried deep within your ass.