While moving my sister wants me

His parents had forced him to spend his Saturday carrying boxes and running all sorts of silly errands for his sister. He had planned a spectacular date with one of his latest conquests and now he was stuck with his younger sister, who all she could do was gawk at him, she didn't understand what was going on, but the girl kept thanking her and trying to always be close. He understood what was happening when after sweating for a while he decided to take off his wet shirt and noticed how his sister tried to stifle a moan of pleasure, that's when he understood that his sister wanted him and he was willing to please her.