For Raul, a new life begins at 18: Madrid, university, living away from family... a private and exclusive university, however, where students are closely monitored by assigned tutors, not just for studies, but for everything in general. Raul has been assigned a very experienced tutor, mature, gray-haired, with a short beard, somewhat overweight, and a serious but kind face... although he was warned that the tutor is only kind if the student behaves well and obeys everything. Raul, with his good boy face, his young athlete's body, moderately muscular, thought it wouldn't be difficult to win over the tutor and that he wouldn't be bothered much... he confidently went to his first tutoring session.

As soon as he arrived, the tutor made him enter a room and told him to stay in his underwear. Raul didn't understand what this was about and asked, annoyed, why. The tutor, very serious, gave him a good slap, told him he was there to obey and not to answer rudely, and to do what he was told, that he had to undergo a physical examination. Once in his slip, the tutor started asking him questions about his medical history, eating habits, and exercise routine... and about his sex life. Also about his grades in high school and his study habits. Raul was embarrassed, but answered everything. The tutor, like a doctor, listened to his heartbeat, took his blood pressure, and examined his throat, ears, etc., and ordered him to lie down and started examining his genitals and even masturbated him a bit. Raul was scared, but didn't dare say anything... until he was told to turn around and saw that the tutor was going to put a finger in his ass. There, Raul rebelled and said no way... but soon regretted it, because the tutor started beating him mercilessly and asking him if it wasn't clear who was in charge there... Raul, with his butt red and hot and almost tears in his eyes, apologized and promised not to disobey again.

After the anal examination, which was actually pleasant because the tutor lubricated him with saliva and what Raul struggled with was not to moan with pleasure, the tutor told him to stay lying down while he prepared the injections. Injections? Raul was very afraid of them... he no longer dared to say he didn't want them, but started asking what they were for, if they couldn't be pills, saying that they would hurt a lot... The tutor continued preparing them without paying attention, told him not to be such a child and to get used to the idea because he would need at least two injections a day for 10 days, and that the treatment would be repeated at least once a month. That they were vitamins to help him study and that he would get used to them... that they were just simple injections in the butt. Raul was dead scared. Since he was a kid, he hadn't been given a shot in the butt and remembered it as very painful, but thought that if he said something and the tutor beat him again, it would be worse.

Raul couldn't avoid tensing u...