Tellingly, I didn't tuck my exposed errection back into my underwear. I didn't even think about it at the time, but I was so hard I probably couldn't ...ave gotten the whole thing covered again anyway. While I was trying to decide what to do, I found my hand was grabbing my meat, and I was beating off in front of Samantha again. "I'm sorry Samantha, you've got me too excited, I can't help myself." Don't be sorry, I like what you're doing to yourself. Would you feel better if I played with myself. Of course my sister thought my reaction was one of shock however it wasn’t and I was frozen in time thinking of all the times she had had a friend stay and I had been wanking in bed in the next room while they were ‘at it’, how fucking hot it THAT?In some ways it was a disappointment but in a lot of other ways it was a relief as her seeing me naked now didn’t have the same connotations and put her catching me wanking in context, I felt a weight lifted however it had filled my imaginary wank. Now. Stroke it. You're going to jerk off for me." Vickie, look, I'm sorry about the other day..." Stroke it now!" She grabs my hand and puts it on my cock! I start stroking it. I stroke it for a bit... Nothing happens. I'm too nervous. I look at her with, I guess, a pathetic face."Oh... alright. Look all you want."Vickie stands up, thrusting her chest out. She's got a hot blouse on. Reaching behind her, she un-does the buttons and takes it off. Now, she's standing in front of me in her designer. As we cleaned Bree came down. She looked chipper as ever but in her eyes I could see it was all an act."How are you doing sweetie?" asked Sarah."It was such a big day!" said Bree enthusiastically. "Need any help cleaning up?" Nope," said Sarah. "You are the birthday girl. It is your day to relax." Can we go out for some ice cream?" she asked."Sure," said Sarah enthusiastically.I shot a look at Ashley and tried to speak before she had a chance."I think I will stay here," I said while trying to.