Focus

You're concentrating quite deeply, but you don't let it show in your face. Instead, you display an expression of relaxed impassivity as her cock slides in and out of your mouth. Internally, you're completely focused on marking time. 1197… 1198… Now. With practiced precision, you engage your gag reflex, allowing your head to rear back slightly and a wet cough to escape your throat as she thrusts into it.

"Wh- again? You seemed to be doing so well! C'mon, I know you can do this, little one~"

You let out an apologetic grunt, still entirely fixated on counting seconds. She's been trying to train away your gag reflex for weeks, and she's succeeded. You aren't about to let her know that, though. If the training sessions have already achieved their purpose, after all, there's no point in continuing them.

It took you some trial and error to find the sweet spot. At first you just tried to hold out as long as you could, but you quickly discovered that wasn't ideal. It only took about 20 minutes for her to decide you're showing enough improvement that you don't need that long of a session today. So, you started intentionally gagging to keep her interested, but that came with its own issues. Any more than about once every ten minutes and she'll start to get frustrated, and eventually decide that she should give you a break and try again tomorrow. The goal is to hit the sweet spot between 15 and 20 minutes; she won't stop for a long while, and because you're doing so well, you get plenty of praise and encouragement. As long as you keep this up, she can go for hours, and by now you've had enough to practice to have VERY fine control over your throat. With a little focus, you can keep her to yourself all afternoon. You hope she never catches on.