WIBTAH to tell my boyfriend to stop playing with my boobs that way

So I(22F) was laying down on the couch and my boyfriend(21M) came over. We started cuddling and then he started fondling my boobs. I was happy with that situation but then he started doing something very strange. He started acting as if my boobs were the joystick of a rapidly accelerating car and also added sound effects. He was basically moving them up and down as the car accelerated and making the noise of the car accelerating and then pressing down his foot on my leg as if it was the brake on a car. I looked towards him with a wtf look on my face and I saw an expression of pure joy on his. He recognized my expression but he didn’t stop doing it as I never explicitly asked him to stop. I however didn’t really like when he was doing that because it was just like wtf so would I be the AH if I took away his joy and asked him to stop?