You are more than a little nervous about going to sleep in Hisa's stomach. What assurance do you have that you will ever wake?
Still, what choice do you have? You are already in her belly, and have no idea who you can get out, along with a lot of reasons to think you can't. So what is there to do except go to sleep? So you compose yourself and drift off.

You are surprised when you do wake, or rather when you are awake enough to be surprised. But then you are awaken enough to realize that if you wake at all, there is no need to be surprised. But you are still surprised because ... Oh bother. By now, you are awake enough to know you have other things to worry about first, for starters, getting out of this stomach.

This actually proves rather easy. Once you start moving, you hear Hisa "Awake finally? OK, time to come out."
You feel a tugging, which concentrates on your feet. That may make sense. Last time you went in head first and came out head first. This time you went in feet first, and are coming out the same way. Or it may be just her whim.
Compared to the secretary, Hisa seems a bit rough. Less skill? Maybe. Or maybe just her style. In any case, you are soon feeling air against your legs again, and then feet on the floor.
But as the last of your limbs reaches her mouth, you discover a definite difference between secretary and Hisa, one that leaves you no time to speculate as to why the difference.

You try to protest her tongue licking your guarded place, but there is nothing you can do, and soon you are not so sure you want her to stop. Even so, you continue to protest, despite your growing excitement, which becomes your overwhelming excitement, and then a frenzied explosion of exquisite sensation.

Hisa continues to use her tongue as she pushes you out, a process that produces another climax for you before you are finally standing before her.

Then she leans back on the bed and announces "OK, I've eaten you, so it's time for you to eat me." But then she spreads her legs wide apart instead of tight together...

You quickly protest "But I've never done that either."

"Well, then it is time for you to do it for the first time."

You resist her demand for a fair length of time, even when Hisa gets off the bed and gives you a hug and a kiss, as well as promises to care. But you both know you will cave eventually. So Hisa is eventually back on the bed and you are getting your head between her thighs.
Once you have accepted that you will, you do not hesitate. Your tongue darts out to stroke her lower lips, and then you use your lips and tongue to maximum effect. Hisa enjoys your efforts, and you can feel her building, and then exploding.

She looks down at you in a pleased manner. "Very nice for a first effort. So now...