"It is considered bad manner to talk when your mouth is full, pet. Now, you have the basics down, so we can get to it! As you can see, half of my cock is still outside your mouth so it is time to fix that!"
I grab her head with both hands and thrust forward with force, causing my cock to completely fill her mouth and lodge down her throat, while my balls slap against her chin.
Hester gags and choke on the intruding piece of meat but I remain balls deep for twenty or so seconds, until I see that she is at her limits, then take a step backward, causing my cock to spring free from her lips. She gags and coughs with teary eyes as I give her a second to compose herself, then step forward again and raise her head by the hair, with my free hand pressing my cock once again against her lips.
"Now, pet, that is called a deepthroat. It is difficult at the beginning, but don't worry, you will get plenty of practice. Let's try again, but this time remember to suck.