At forty three I had been banging my secretary for a good five years when she came to me and told me that she was leaving. At first I thought that perhaps she had found a better job and perhaps a raise might sort it out. Then she told me, "I'm twenty six and I'm pregnant." I had thought that she had put on a little weight. I wasn't quite sure what her age had to do with it, but a raise wasn't going to fix this, especially as there was a better than 50/50 chance it was one of my raises that had caused it. She was quick in telling me that she was raising it as her husbands even if it wasn't. I didn't argue against that. Then she told me that she had a suitable replacement for me when she left. I asked who it was and she just laughed. Three months later on the Monday morning Sofie turned up with what looked like a slightly younger version of herself. Sofie introduced me to Harriot "Harry" who she would get up to speed before she left. It was only now that Sofie told me that Harry was her younger sister. They already had a coffee waiting on my desk for me. At least that was normal. Then at ten as she always does Sofie, with Harry, came in to see if I had anything they needed doing. I gave them some files for filing and told them that was all for now. Ten minutes later they were back with my morning coffee. Then Sofie told Harry it was time and as she shut the door Harry slipped under my desk and took my cock out and proceeded to suck it. Wow Sofie really was training her on my ways. The excitement of a new and younger woman sucking my cock had me coming quite quickly. Sofie watched as Harry swallowed my load and then ask if there was anything else. Then Harry gave a little giggle as I told her that would be all for now. Midday as everyone went off to the canteen Sofie and Harry came into my office again. They both bent over my desk and neither was wearing any panties. That was normal for Sofie. I would normally fuck Sophie, but wanted to try out the new girl. I took out my cock that was already hard in anticipation and stood behind Harry and slowly pushed it in up to my balls. While I plowed Harry's pussy I stroked and fingered Sofie's. I could see the two of them looking at each other as I fingered and fucked them. I asked Harry was she on any contraception before dumping my load in her pussy. Then as I sat back in my chair Harry sucked my cock clean for me. Sofie was training her well. In the afternoon I had reason to talk to them a couple of times and at three they came in again with coffee and asked did I need anything else. I told them no that I was ok. Later when they were about to go home they came to me to tell me unless I needed anything else they were going home. I told them I was fine and they both kissed me and went on their way. Tuesday was much the same except Sofie gave me the early blow job and I fucked Harry at lunch time. The following three days they alternated between sucking and fucking me. Late on the Friday Sofie assured me that Harry had a good command of her other duties. The next week although Sofie was still there Harry did all the work, and that included blowjobs and fucks. Sofie would just come in afterwards and ask was everything ok. I told her it was and she would return to other work with Harry. There was just one week left before Sofie was leaving, and although she was getting big, I still had her bend over the desk and take my cock. Harry did the blowjobs as it was easier for her to get under and out from my desk. Then it was Sofie's last day and we had laid on some eats and drinks and her husband came for the celebrations. Whilst he talked with other staff I took Sofie into my room for a final fuck before she left. We had to be quick so that she wasn't missed. Harry stood guard to deflect anyone from bothering us. At the end of the day and the party I shook hands with her husband and told him he was a lucky man. He agreed and then they left. It was some while later when there was some commotion in the outer office and when I went out to see what was going on Sofie was there with her new baby. He didn't look anything like her husband. And after she had left Harry joked that he looked just like me. I gave Harry a specially hard fucking that lunch time. Harry had been with me for almost three years when she gave me an invite to her forthcoming wedding. Wedding! I didn't even know she had a boyfriend. I attended what was quite a formal affair. During the course of the evening I managed to get Sofie to myself and although she now had two children she went with me to my car where I fucked her silly in the back seats. On Harry's return from honeymoon she resumed her duties, including her extra duties. It was nearly two years later when she had finished sucking my cock at morning break when she told me that she would be leaving. She smiled as she told me that she was pregnant. I was a little surprised, and having composed myself, I asked, "Have you any more sister?" Harry laughed. "Suppose you want me to find a replacement?" she asked. I told her yes. Four months later when Harry had found and trained her replacement she left to have her baby. Her replacement? It was an aunt. She might be nearer my age but can she sure can suck and fuck. the other good news is that mothers and babies all doing well and Brenda my new secretary has already had her family and doesn't want any more. I think she might be my last secretary and last up till I retire.