So...I've developed (actually through weight gain)  a nice, small cup B over the years, nice shape, beautiful nipples.

Before that I had a  AA cup, actually big nipples only, BUT no lines.

Now I'm developing these lines from under to between each breast, which annoys me to no end.

I'm a belly/side sleeper....is this the cause of these developing lines?

I've been browsing "007 Breasts" image gallery, but no pictures of the lines I'm developing.
Either the natural breasts are too big, covering these lines or the pictures are too small or too dark.

Has anyone has the same problem? Not from BA/silicone, but natural breasts?

How to prevent, how to get rid of them?

Laser scares the hell out of me, burning, which it actually is,  such thin skin doesn't seem a good idea to me.

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Lines... Do you mean, growth marks? Wrinkles? Something else?

I'm sorry, I don't really understand what you mean. Neither what kind of lines or where the lines are, actually. If you can't find a picture of such lines, perhaps you could manage a drawing/diagram?

Yeah, I couldn't imagine what those lines look like. Are they like stretch marks?