Summer Fling??

So a guy from my class asked if I wanted to have a summer fling. At first, I wasn't quite sure exactly what to think because I wasn't sure what he meant.
But when he finally cleared it up it was clear that he just wanted to kiss and makeout, "just for the summer" and then end it. 
He asked me what I thought about nudes, and told me that over the semester he had been "sexually attracted" to me. 
When I said no to the nudes, he also sent me the face :/
I did refuse him. 
The thing is that we've only just finished 10th grade, and I barely know him, though that's apparently the point of a summer fling, an "unconnected relationship." Do you think it was normal that I said no? 
Also, is that creepy? 
I just want a couple more opinions on this, since most people here seem quite reasonable.