Im 20 years, a girl who is not fat. My brother who is 15 years old always likes to sit on my belly, while watching TV while reading books. Frankly my belly has become his seat. I allow him to do so as I love him, but it hurts sometimes, and it feels discomfort after, and hard to breathe while he is sitting, Is this risky to my belly?

Since you love him, and he no doubt loves you, I'm sure he would not want to cause you pain or discomfort. Let him know that it hurts (he is only going to get bigger and heavier) and that he is welcome to sit next to you.

As far as risks, it can potentially cause some concerns such as a decrease in blood flow and a hernia.

It's not good for you and if you ask me, it seems a little....uh...creepy, for lack of a better word.

I don't understand your post, does he have dominance over you, because that is what it appears to be; does he have sexual connotations with this ?

You need to stop this NOW. Yes, you will have long term damage to your internal organs because of this. What does he weigh exactly?

So you love him and care for him, but this is a bit too much don't you think?

Do you not have parents around, and how old is he ?

Just give me a break, I don't even like your question if you don't know what is going on here and you are, what, 20 ?

It can cause harm, you need to stop