What is really going on?? Are we together??

Okay so he is 15 and I'm 13 he is one of my older sisters friends we hang out all the time I tell my mom I'm going for a run and I run to his house. It always starts off with us cuddling and holding watching tv than he pauses the tv then we start to full on make out and he humps me a lot (both on us in just underwear)but I always end up having to leave or one of our phones go off..

Last time I was over he asked me to jump in the shower with him but I already took one before I came over so I said no... I really like him and he is just too sweet and understanding.. I know this sounds really odd but I guess what I'm saying is what is he too me?

(Please no hate)