A partial escape is to follow, but how soon? Tiny Misadventures, the Interactive text story chapter 4 by Calvitonks

Overall, you are inclined to remain with the girl; your gut feeling tells you she is a nice girl, one who will take good care of you. However, you're not so naive as not to expect that this perception of yours might be wrong, since you've only met her a few hours ago. 

You consider all possible options, concluding that despite the risk, remaining with her still sounds far more appealing than leaving her: no matter where you would escape to, it would mean a life of daily struggle, scurrying around in the shadows and tight spots to remain hidden while searching for any scrap of food or useful materials you might need to survive.

In comparison, it would likely be a lot easier to remain with this girl who provides you with direct access to sustenance through her milk, a warm and comfy place inside her breast, all in return for squirming and licking around to make her feel good, a challenge by itself but where any "failure" would never be life-threatening so long as you obeyed her (assuming this girl is indeed gentle).

Therefore, your mind is set on what you call a "partial" escape, one where you do exit her body, but don't run away from the giantess, choosing willingly at that point to remain with her.

With that matter solved, now another arises: how soon will you want to attempt this partial escape of yours? The timing matters, since attempting it while she's not in the mood might spark unnecessary tension between you two going forward, while attempting it while she asks to have fun with you and is thus focused on each of your actions might make it harder to succeed. These are but a few examples.

How do you proceed?