RCT-604 Entrance exam mom's beloved son's ejaculation control

In order to improve his grades for the exams, Mommy has been working on controlling her son's ejaculation! Until the day of the exam, Mommy gives him handjobs and blowjobs, sticks stickers on a calendar, and strictly controls his ejaculation to one per day. Her young and cute tutor also rewards him with a blowjob... And as punishment for ejaculating anywhere other than Mommy, she punishes him with a chastity belt! Gradually, Mommy starts to desire it too, and he can't hold back, leading to incestuous sex five times in a row, even though it's the day before the exam!