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*** tells me that my step-***ther is upstairs and he's in agony, so I go upstairs to find him sat on the bed. I offer to give him a massage since it looks like he's got cramp in his leg, maybe that will help you step-***ther? But to do a proper job I'm gonna need you to take your jeans off. Begrudgingly he takes off his jeans and since he's not wearing any boxers, he covers his groin with his hand. I start to massage him - searching for knots in his leg, but I can't seem to find anything. I work higher up his leg and my face is practically in his lap, when his cocks slaps me in the face!!! Oh my god, step-***ther!!!! What an earth is going on, and why do you have a hard on??? I soon realise that in actual fact, my *** does not have leg cramp - he has blue balls!! He's in so much pain and being a good step-sister I really want to help. Maybe I could try to massage your.... eh.... crotch area? I use my hands to massage around his cock but it's not quite working. I try some different techniques including using my boobs around his cock and eventually my mouth too. He still has a great big hard on - if anything it's actually worse! I really need to help my step-***ther to shoot his load, but since I'm his step-Sister, we can't actually FUCK?! I have an idea though ***... how about if you just fuck my butt cheeks instead? We can oil them up and you can try. That way, we aren't doing anything wrong, you're just fucking my butt cheeks! I really want to help you shoot your load, step-***ther