You are in the bathroom when you hear your step-sister banging on the door- She is desperate to use the toilet! She lets herself in, not even caring you are there because she is so desperate. You watch her pull her panties down and the plops start coming. She has been constipated for ages and now it's finally all coming out! She uses all the toilet paper and runs out while her asshole is still messy. She pleads with you to grab her some more paper but you find it so funny to watch her struggle, so she has to waddle past you with a dirty asshole to get some more. She wipes some more and then thinks she might need to go again, so sits back down on the loo and tries to push some more out. She is getting constipated again, so starts moaning as she pushes so hard. She keeps telling you to get out but you don't. You just watch her squirm on the toilet, getting a hard dick and you don't even care if she notices.