0.3mm. Wow. While not completely invisible, you are imperceptible to the human eye's casual glance. Shyanne's words were ones of faith; there's no way she could see or feel you on her palm, much less notice you flinging off of it towards her body.
You fly for what seems like eternity, until you land with a remarkably soft thud into a wall. For a split second, everything seemed dark, but you bounced along the edge of this oddly soft and warm cliff-face until light shined in, and you land at the bottom of the cavern safely.
You remembered from your view at 1 inch tall that Shyanne was holding you at waist level, which means that you must have landed in her navel! You were terrified earlier of your predicament, but something about being in here made you feel a bit safer. You're too tiny to hide anywhere else on her body, save for maybe under her nails or between her teeth... and those spots have their obvious downsides. At this size, you can see all the fine details in her skin; she truly looked like a beautiful, living mountain.
Reaching out along the sides of her innie, you glide your fingertips across the surface. It feels as warm and inviting as the flesh you had rolled over to get here. You reach out with your hand, thrusting your palm into her smooth skin. It felt magnificent.
However, when you tried to pull your hand off, you were unable! Somehow, your palm was sticking to the skin. You try to pull it off with your other hand, and it gets stuck to your arm. You try to push off with your feet, and your soles get stuck to the surface of the navel.
You start to panic, screaming and trying frantically to wiggle yourself out. You thrashed and writhed, but you were getting nowhere. It was necessary to take a moment to think. As you close your eyes, the intense wind somehow not blowing you off, you feel your grip loosen. Your hands start to unstick, and you fall softly off the wall as your feet peel away from it.
"This must be a side effect of the serum... I can stick to things like a bug can" you surmise. While this was pretty freakin' cool, you know that it is a very dangerous world for a bug, especially one as microscopically tiny as you. There could also be other, more damaging side effects that she wouldn't know about. You need to get Shyanne's attention.
However... part of you was entralled by this situation. You had much more of an appreciation for the female form than any housefly, and you have always admired Shyanne physically. She may be annoying, but she is young, and you know she'll probably grow out of this whole "ownership" phase, especially if she has someone like you around to show her the way. Granted, you don't have much experience with women, but you feel welcomed by the warm body all around you, not threatened. Something about being this tiny, in an enormous canyon that is nothing but a cute girl's belly button... it's intoxicating. Her scent was amplified all around you.
You figure Shyanne wanted you a bit bigger so she could yap to you and command you to do annoying things, like paint her toenails or give her massages. At this size, all you can do is traverse across her continental surface, and try not to get dizzy.