Would I look after Catherine for the holiday, she asked, while they sorted things out? She assured me she had spoken to the headmistress who had agree... to this plan. And so it was that Catherine stayed with me in my flat for three glorious weeks. Our affair started on the first day she was there. I came into the flat to find her in the kitchen with her back to me making a cup of tea. I decided it would be now or never. I walked up to her, stood behind her and gently cupped her tits in my hands. Her hand wrapped around my morning wood and my hand between her ass crack."What is going on here?" Mom stammered. I laid there speechless."We were sleeping mom" Sara giggled.Sara started rubbing my cock. " Let go of that!" Mom whispered. Sara slid down my body and took my massive erection in her mouth slurped on it then looked at mom yummy!" Be quiet! Your going to wake your sister." Mom spoke softly." She was in here last night" me and Sara laughed."Omg! This is i*****l! " " I can't believe. "But I have a better idea," She suddenly backed away a minute later.Almost before I realized it, she stepped out the door and then out of the bedroom. She had done it again. I stood hard and wanting for her to go on."I have a better idea," She yelled from the hallway. "Why don't you go next door to see if Yuka might let you use her shower?"I knew it immediately! I understood! I also knew why the water was out. This was all part of some game. Katie had probably gone downstairs in the early hours. She just laid there in silence and I chuckled again. I whispered that it looked like she really enjoyed it and Amy blurted out she wasn't a slut. I kissed her and said I wasn't saying she was a slut. I was just saying her fantasy seemed to be as good in real life as it was in her mind. Amy said it would never happen again and said she was really drunk tonight. I kissed her and said it looks like her kitty really thinks size matters. I smiled at her and said I couldn't believe that his cock fit.