To tell you the truth, considering the age of the brother and sister, it is quite normal that the brother became aroused by the sight of the naked girl in front of him. Maybe what happened next is not part of the plans of normality, but tell me honestly, would you resist such a dark-haired beauty? That's what I mean.
Two temperamental ladies for one man is great! I know it's hard, but it's worth it! Surprisingly easy dick flies in the anus with the ladies, judging by the good training in anal sex and quality lubrication. I've never seen a lady who enjoys anal sex that much, and that's a pity. I've tried it with two of them, it's very cool. But the problem is, the next day my balls hurt so bad it makes my eyes pop out!