Wait until she is in the bathroom, with (hopefully) the door unlocked. Undress, wrap a towel around your waist, and walk it, pretending to want to take a shower. Whilst with her (hopefully she is naked also, but even if she is still clothed, it does not matter), say "sorry, I thought the bathroom was vacant," and then make sure the towel drops, revealing you in your naked glory. Hopefully you will have an erection by this time. Then fumble to wrap the towel around yourself, giving her ample time to see what you want her to see. And of course, asking her to excuse you for the "accident."
If she stares in amazement, just ask her "Haven't you seen a penis before? Well, have a good look....."
Is it normal to want my sister to catch me naked
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Wait until she is in the bathroom, with (hopefully) the door unlocked. Undress, wrap a towel around your waist, and walk it, pretending to want to take a shower. Whilst with her (hopefully she is naked also, but even if she is still clothed, it does not matter), say "sorry, I thought the bathroom was vacant," and then make sure the towel drops, revealing you in your naked glory. Hopefully you will have an erection by this time. Then fumble to wrap the towel around yourself, giving her ample time to see what you want her to see. And of course, asking her to excuse you for the "accident."
If she stares in amazement, just ask her "Haven't you seen a penis before? Well, have a good look....."