The desire to touch my cousin’s sexy round ass

This story is about my younger cousin who is 14 year old(F). Who I wanted to touch for a long time.

So I am a 16 year old boy. My name is Kevin. My younger cousin’s name is Margarita.

Her family moved to US from Argentina 3 years ago. She has two siblings. Maria - younger and Jose - 1 year older. I actually touched Jose’s butt. But I only do that while he’s asleep. There may been some times that we play PlayStation and I pretend to touch his butt accidentally while going over him to lie on the bed next to the bed that he lied.
But when I try to touch his sister Margarita while she’s asleep She breathes a little bit louder and moves a bit. Every time she does that I become very afraid and go away. But her brother isn’t like that. He sleeps like bear. I even touched his sexy round ass from under his boxers - completely naked. It was the best thing. While masturbating I actually think of fucking him. I think of a scenario where we play truth or dare and every time he chooses dare i tell him to take off one piece of cloth. And he eventually takes off his boxers. The next dare I tell him is to let me touch his butt. And Fuck his bare ass. There is one more scenario where we play rock paper scissors and every time he loses takes off a piece of clothing, every time i lose i take off one piece of clothing. I wouldn’t call me gay because I touched my brother only because he wouldn’t move as much as his sister. I also think of fucking his little sister Margarita. She has a bit outlined tits but not big.

Once I touched her round butt from over her pajama. But it was like 1 second.

I would very much appreciate any ideas to how to touch her so that she doesn’t wake up. Or maybe it is me who gets afraid and thinking that she will wake up. Please do write ideas in the comments. Thank you for reading this much. It is my first story. I will definitely tell you how went the touching of you write good ideas.