Is it normal that im female and i get turned on when im with my friend

Im a girl and i sometimes have a sleepover with my friend, shes got quite large boobs and sometimes we play games when the other person shuts their eyes and we guide their hand to a part of our body, and they have to guess what it is, usually we do normal places like elbows or toes but sometimes we do nipple or boob area, and after doing this i always get aroused and excited and i want her to touch me again, is this normal? (I have never wanted to date a girl, and ive only ever crushed on guys, i have never dated anyone before but i know im not a lesbian)