Is it normal my sister sits on my lap?

Put your foot down, and tell her NO! If she makes a stupid excuse tell her she's not a child, and that sitting on people's laps is for little children, and babies. If she gets upset stick by your guns!!! If you have to tell her it makes you feel uncomfortable, and that you're discomfort is good enough reason to say no. She sounds like a little brat!

You or your parents or anyone else aren't doing any her and other younger sibling types like her any favors by giving her whatever she wants, because that's just enabling and she needs to get used to people telling her no.

ask her for sex. dont let this go by. she does that to see you hard.

I wish my sister did that to me maybe she is teasing you to make a move on her I would fuck her given the opportunity but that's just me

Do you enjoy it? I might be biast because I get off on incest, but I mean if you feel weird about it then confront her.

You got a chance, take it!

Your sister likes your bone. Nothing wrong with sexual curiosity. Tell her enough is enough. Maybe you could take a shower together.

You should tell her its enough. This is disrespectful.

In my culture, in fact ALL black cultures in South Africa, its a disgusting thing to do as a woman. She should respect u as her brother and not wear short things around u and sit on u like that. Its even weird that she's ok with u getting a boner from her. So weird. What kind of a sister is he???

I know whenever my brother is around the house, i have to cover myself and dress appropriately. I cant be showing off my boobs and ass around my brother cause he is a man, u know what i'm trying to say.....Imagine your brother seeing all your assets, what is he supposed to think or do. Or how will he respect you as his sister...?

Of course she wants to see your 6 inch boner cock in the flesh.
Sit together on the couch with you in your boxers and she in her nightie.
Then all of a sudden stick the head of your cock through your boxers and she will say , what are you doing and you say he wants to come out and play , then she will say , okay , bring the rest of him out so I can see him.
Then she will start stroking it and put her head down and suck it and lick your nuts.
Then put your hand on her knee and work your way up her thigh to her wet and juicy bald cunt and stick 2 fingers in her hairless twat and stick a finger in her poop chute and then put her pee , cum , poop from your fingers on her nipple and tit and you both suck it off her tit.
Did you take baths together when you were younger ?
Did you play with each other in the tub ?
Do you walk in the bathroom now if either one of you have to pee or shit when the other one is in the shower ?
When you are in the shower , call her in the bathroom and when she comes in , peel the curtain away so she can see your 6 inch boner cock and she will say can she join you and she will jump in the shower with you and she will soap up your pecker and balls and then drop the soap and tell her to pick it up and when she bends over , shove your 6 inch boner cock in her shit pipe and in her bald cunt.
Has she ever caught you jerking off ?
Have you ever caught her masterbating on her bed with toys in her cunt and in her ass ?

I need to fuck your stinking asshole ASAP

That would make me feel uncomfortable, if my sister did that

If you are uncomfortable tell her to stop. If you enjoy it, then enjoy it.

@RoseIsabella, you are right, she is not a child. She should not behave like that.