I'm in a room alone at a costume party, dressed as a sexy nurse, when suddenly you walk in. "Oh my god, StepBrother, what are YOU doing here?? And stop looking at me like that!" I find it really odd that you're at the same party as me and I berate you, asking if you followed me here like a weirdo?? You didn't tell me that you were coming and now you can't take your eyes off me in my nurse outfit. My eyes drift down and I realise that you've got a hard on!!! If anyone walks in and sees that you've got a hard on from looking at your StepSister, this is going to be really awkward. We are going to have to get rid of that. "Oh fine... I guess I'll help you, but this is a ONE TIME ONLY THING. And no one can ever find out about this"