Uh, no. Lolis, that is the "sexualized" form of pre-pubescent looking girls, almost always deal with innocence or the dissonant lack thereof. The conflict comes from the loss of innocence, in strictly non-pornographic works the prevention of the loss of innocence, and in both, the realization that there the innocence is already lost, and that's usually played for comedy (that dissonance.
I'm really just assuming on the pornographic end, but since lolis tend to fall into the roles of the woobie, the cutey to be broken, and the cutesy comedic relief, the move into porn isn't that hard. The situations and jokes all remain the same set around innocence.
Shota gets to go into sexual experimentation because of the audiences and because of the "boys will be boys" idea. They're boys so they can't be "taken advantage of" like the loli can. Really, these character types just play off of the general cultural assumptions about children, so figuring them out isn't very new, exciting, or anything like that.