start masturbating with her

He quickly unzipped his jeans and let them drop to the floor. Then quickly whipped his cock out and started rubbing it slowly while still staring in awe at his sisters fingers sliding in and out of her pussy.

He could already feel his balls were aching to blow but he wasn't done yet. He sat down on the bed next to her and told her to lift her top up which she did so without hesitation. he placed his hand on her right breast whilst continuing to rub his cock slowly. Her breasts were warm and smooth, he felt her nipple becoming erect with his touch so he pinched it hard. She let out a squeak which prompted him to put the music back on.

"look at me" He whispered. She slowed moved her eyes up to his, her mouth was slightly open and she was breathing heavily. Jack could see in her eyes that she wanted to cum, and so did he.