My brat cousin moaned when I pulled her hair

My(20M) cousin(19) was pulling my hair, poking my biceps and tried to climb on me, she's weird that way, always trying to irritate people. This time she pulled my hair and ruined my game and started going away, that was when I put my fingers till her scalp and pulled her hair in a way her movement stopped and she moaned, that sounded weirdly hot at first, then I started pulling her hair whenever i could and lately she has become fully silent and now her moans have become softer and sensuous and tbh I really think she has noticed my boner too