You wake up, minimal light filtering through the giant girl's skin. This, combined with the fact that unlike in the previous hours, she's completely still, her respiration and heartbeats are a lot slower, all tell you one clear thing...she's asleep.

Deeply so in fact, likely in the middle of the night. You don't remember how long it has been since your first interaction with the giantess (the "training session" as you can mentally picture her calling it), yet it has been a while, enough for you to be fully recovered energy-wise from the exhaustion of the first session. 

Then, with only the slow, rhythmic sounds of the giantess heartbeats and breaths, you have for the first time the freedom to ponder your situation: your reduction in size, your new status as a "tiny", being literally inside a cute girl's breast, and expected to pleasure her when she demands it of you, plus everything else.

Looking back, you cannot forget the swelling of pride in your chest as the mere fact that you, despite how small you are now (roughly around a single inch if your estimations are correct), were still capable of making such a gigantic, and gorgeous girl feel...you also cannot forget how difficult it was to keep that momentum: it took but a few slipups, and you quickly found yourself heavily tired and deep inside the girl's teat. 

Similar things applied to your wriggling: there were times that it was a breeze, barely spending any energy, while at other times, you screwed up so badly that you were pulled back while being sap of a lot of energy. As for resting, even though you could expect times when you would recover a lot of energy in a few seconds, it could take a single strong pull by her to bring deeper inside her while at the same time practically preventing any recovery.

In simple terms, it would likely always be a struggle to act as you wish at any given moment; even now with her sleep, you likely believe it wouldn't be easy.

So, instead of immediately and perhaps rashly trying to escape, you began to think about all the likely possibilities of the path forward: would it be worth it to escape right now, or even try to escape in the first place? If you considered not escaping then what, would you just like to remain as this girl's pet, willingly obeying any command, or would you instead attempt to convince her of your human nature by acting in a way she likely wouldn't expect from a tiny? 

These possibilities of both immediate steps as well as what you would want to do after are matters that you spend several minutes mulling over; eventually, though, you would have to choose what way and towards what goal you would work towards.