Sister Shared Bro...

I have been feeling really strange lately, towards my Brother. For some reason every time I look at her, I start to hurt in my private. I try to massage it, but it does not go away. I have never felt this pain before. I do not understand. My Brother is always naked. It has never been a big deal before, but now it does not stop. This pain I have. I try to make it better but it is no use. Help me Brother, please it hurts.