If you mean your boyfriend masturbates, alone at home, with you as his fantasy. This would be perfectly normal for a boy his age. This is something you can not have any control over. Masturbation is 80% fantasy and 20% dexterity.
Now if you mean your boyfriend masturbates in your presents, possibly with you partially or fully naked. This too would be normal as long as YOU ARE OKAY WITH HIM DOING SO. If this bothers you then it is wrong. What makes it wrong is you not being okay with it.
When it comes to sex, which you two are both too young to be having. There is nothing you can do with a partner that is inherently wrong or weird. Just as long as you are both consenting to doing whatever it is.
By law neither of you are old enough to consent to having sex and as I've said you're both too young to be having sex. If his jerking off, as it is called, over you does not bother you then it is not abnormal and should not be considered wrong.
Your parents may not agree with this though so be aware of where and when you let him do this. Also if you are naked when you do so and make sure he aims for the upper half of your body well away from your vagina. This is so none of his stuff, which contains semen, can possibly get into your vagina. [ adviceman49's advice column | Ask adviceman49 A Question ]
Rena-Chan answered Wednesday August 21 2013, 10:12 am: It's natural for anyone to masturbate, especially as a teenager. This is when hormones are beginning to really go haywire and this will cause sudden urges to. As for... you asking "over you", do you mean, as in fantasizing about you? Or physically doing it over you, while you watch? ;/ If so, I can't say don't do that, because it's entirely up to the person(s) involved. If you want him to, then you'll have him do it. If you don't want him to, tell him how it makes you feel when he does this and ask him to stop. But as for masturbation, it's entirely natural for young ones to do so, it's a form of self exploration as well as being able to get to know ones own body. [ Rena-Chan's advice column | Ask Rena-Chan A Question ]
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