No, now is not the time

Fuck he wanted her so bad. And as she started to peel off her panties he had to look away. Fuck he was so full of hormones and desire. He wanted to bend her over and fuck her right there. But maybe that was the issue. No, he couldn't go just yet. If he went right now, she could be thrown of, shocked, start screaming. They had just had a nice evening together. If he let his dick get the best of him now, he could ruin everything.

He took one last look inside the keyhole and was dismayed to find out she was already in the shower and he couldn't see anything. With a sigh he headed back to his room and decided to wait. He needed to get his mind off her. So he did the only thing he had ever been able to do. He took hold of his solid cock and started to stroke himself off. Imagining her nude in the shower. The water running over her perfect body, her hands rubbing her tits and soaping them up, softly moaning from the heat of the water.

He was already pent up and needy with the thoughts of his own sister, so it didn't take long to cum. He came up spurted his cream over his own stomach. Good thing he was about to shower!

"Hey I'm out! You're good to go!" He heard her call out and he sighed. Opportunity gone. But at least he could think clearly. He would think of something else. Maybe tonight.... after she went to bed.... he could sneak in while she was asleep. She would certainly wake up, but if he played his cards right, his hands would have worked her into a pleasure induced euphoria she couldn't resist. Maybe.... for now though....