Allowing my own penis to be spread open, I stimulate it near the entrance with a tsun-tsun motion, transmitting the heat of my penis. Gradually and slowly, I insert my penis. When I deliberately stop halfway... 'Go deeper,' she begged. I thrust in deeply, rocking my hips in a knocking motion, continuing to insert at my pace until just before ejaculation, and without her permission, I allowed myself to have a pleasurable internal ejaculation.