well, my BF has a serious want for younger girls. He currently is doing a 17 yr old on a fairly semi-regular basis. he also travles a fair bit & has found a few high school age girls here & there.
He has outright said, for sexual experience (not their experience level, but the experience of fucking a tight girl) he loves it. BUT he wouldnt in a million years consider dating one of them because he generally finds them annoying.
Ironically the 17 yr old hes playing around with these days WANTS a relationship with him & has been pushing for more form him weekly. He has tried scaring her off by telling her what he & I do & that she could never win him over because she wouldnt dare try any of that, yet she has so far not balked at any of his suggestions & just this last week he has finally accepted that he has to figure a way to cut her off completely, althogh he also says he doesnt want to because he love how good her cunt feels wrapped around his cock.
I personally am OK with him doing this. as without it, he would likely run me into the ground. As it was, before she came around I was getting worn out by his sexdrive. I may love it, but he seems to just love it that much more.
I think, if she wants to be just fuck-buddies. Congrats for you. However, if she is hoping for some emotional attachment, run & hide. We arent a very stable emotionally settled bunch in our teens (hell even at 25 I cant say I;m all there).