Dude is not reading her reaction when he goes in too deep. He’s hitting her cervix and that hurts! Frankly she deserved a more considerate fucking not just a rough one! She alternates between enjoyment and pain when he doesn’t realize what is going on inside her pussy when he thrust deep at certain angeles. Learn to gauge that young men and she’s putty and a slave to your mastery of lovemaking!
Reminds me when i.was stationed in Korea. I dated a Korean teacher that was 5'4 tall and weighed 109lbs. I beat that pussy up!! She hollered and screamed but loved rough sex