I messed around for a little bit, then set the coffee pot up for the morning and headed up to tuck the girls in.When I went into Sandra's room, she wa... sitting up in bed waiting for me. I sat down and waited to see what she had to say."Grandpa, I'm sorry if I put you on the spot tonight. I didn't mean to ruin your surprise for us. We have been talking all week about going to Disneyland and how much fun it would be to celebrate our birthdays there, is all." Sandra, can I tell you a secret?" Sure. When she got to Megan's rooms and burst through the unlocked door "Screw y - " she began before noticing her sister in mid change in just a bra and nothing else. It wasn't like she hadn't seen it before, hell, she saw if every time she looked in the mirror. Megan's pussy was shaved and her stomach was flat with some abs showing through form the years of running around a soccer field. She was actually wearing a girly bra for once, that was weird. "Sorry, I didn't know you were changing, but why. After a lot of effort it went inside a few inches. I stayed in that position for sometime for my tool to get adjusted inside it.Didi couldn't bear the pain and she was almost on the verge of crying. I kissed her and told her to close her eyes and relax.With a sudden push I buried my penis inside her ass completely. I started my to and fro motion and she began to enjoy it. I was grunting like an angry dog. She was making cute sounds like a cat. I knew this time I would last longer I pressed her. Oh, ohhhhhhhh… oh yeah. Thats oh thats great. Mmm. I could feel her smiling as she moved to my shoulders. Jamie laughed a little then suddenly got serious. You hold all your stress in your back, dont you? She said as she finished with my right shoulder and started on my left. I dont know. I guess. How, oh ohh ohhhhh, how much stress could I re-reallyyyyyy have? I mean, school gets, yeah right there, gets tiring but not bad. I said honestly. Oh ok, youre just very stiff. She said, finishing with.