Not wanting to be felt out Tony and Dan were soon in their underwear, Dan in red boxes and Tony wearing sheer lacy black panties, which could not cont...in his nine-inch hard cock. I just love a man in panties. It was clear that Dan's large cock was also very hard. Kari leaned back against me and I soon hand one hand in her panties and the other one on her left tit. This only made Dan and Tony's cock try all the harder to escape. Kari asked in her sexiest voice okay boys whose cock does Sara get. I decided I’d had enough sun and went up to my room for a nap.I woke up from a dream where I’d been on the brink of a wonderful orgasm. It was much later than I thought - already dark outside. I reached my hands between my thighs to find that I was quite wet. I could have just finished things off with my fingers but I decided I wanted something more fulfilling.I had my black vibrator, about 9” long with a real cock shape, in my hand when I heard voices. Not loud, but not happy voices either. I. ”Candy added, “It was Danny’s loss because that was when Mom let Dad start fucking her.”By then I had fully recover and I was hard as a nail. I slipped my cock into Mandy and she closed her eyes and smiled. Candy asked, “Doesn’t it feel good?”Mandy replied, “Oh yes! It is the best feeling thing that I’ve had in my pussy.”Right then I realized another difference in my identical twin sisters. Mandy used the word pussy and Candy used the word cunt. Interesting!So I asked, “What else have you had. Jen: I will do much better today. I will be a good student! I do not want to be spanked.Richard: We’ll see.During our study session I could tell that Jen was trying harder than usual, at first, but her lazy traits soon took over again. Every time I noticed her failing to try, I took a small notebook from my shirt pocket and jotted it down. Jen dropped her head each time and muttered something that sounded like: Oh shit. Before sending her home I ordered her to my home office. Jen was.