彼女は成績を上げるために彼の小さなペニスを一生懸命しゃぶっています

Asking her math tutor for extra lessons didn't work for her, and being desperate to get her grades up, she goes on trying to seduce him, showing him her perfect ass and tits and grabbing him by his balls before she gives him a blowjob. She's sure, after all that, he won't refuse her anymore