The next morning I awoke early to get some chores done in anticipation of spending most of my day in the next installment of educating Sara. The rest of the family was out of the house by 10:00 am, not expecting to return much before 4:00pm or later. Around 10:30 am the phone rang, and Sara got it in her room on the first ring. About five minutes later, I hear the shower going and soon after, she was down in the kitchen grabbing something to eat.
"Looks like you are in a hurry" I said. "I have to go see Karen for a little while. She needs help with some of her homework. I shouldn't be long" she replied. I told her that was no problemβ¦I would have plenty of things to keep me busy. "Don't worry, I will be back as soon as I can. I can't wait to practice more homework" she responded with a smile. "When will Mom and the girls be back?" she inquired. I told her late afternoon. "Great" she said with a silly grin.
Around noon, the phone rang, and it was Sara telling me she was done with Karen, and would be home in a few minutes. I told her "I can't waitβ¦.I'll be in the family room working on the computer when you get here." Karen lives only a block away so I knew Sara would be home shortly, so I decided to surprise her by being naked at the computer to see how she would react. I heard the door open and Sara say "surprise!" as she walked in with Karen! I don't know who was more surprised when they both saw me naked. I had nothing to grab easily to cover up, so I was beet red from embarrassment until Karen broke the ice and said "Sara said you have a nice cock, and she wasn't kidding." I had played with myself a little so it would be partially erect when she got there, not knowing of course what a surprise I was in for. I was at a loss for words. Sara then said "I told Karen about how much fun you and I had and she told me she wanted to join in." I looked at the both of them with my mouth wide open, unable to speak. "That's ok, isn't it?" Karen asked. I said "Do me a favor and toss me my shorts please" and then caught my breath. "You are 18, right Karen?" I asked. "Yes, I was 18 a couple of months ago."