My birthday present, as delivered by my mother on the actual day, or rather evening of my birthday, was Helena, herself, with Margaret and Louise. A full night of erotic and lascivious exertions that was.
We shared an intimate meal in my room and then retired to bed. Straight away we fell to fucking.
At one point I made Margaret and Louise repeat their 'play' of how they had progressed from watching 'Stable-yard Mary' to the time when they convinced Helena to be allowed to tend to my manly needs while she was away at her brother's house when her father was ill.
Once again, they took to their parts with gusto, and soon Helena and I were enjoying their erotic presentation, their mimicry of lusty stable boys, and amorous maids, and finally their marvellous portrayal of the 'conversation with Helena (who watched it dumb-founded at the skill - and some of the half-truths with which it was embroidered).
We laughed so hard that my mother had tears in her eyes and at the end she joined me in proclaiming it a masterpiece of acting. The twins were very pleased by that, and as a reward for our lavish praise, they offered Helena and I, full use of their bodies, in any way we wished.
Helena enjoyed having both of them worship her cunny, while I took turn-about on their quims, first Louise and then Margaret, and then back to Louise and so on. My mother, as you are surely aware by now, loves having her pussy licked, and she surrendered herself to their attentions, squealing in delight, and writhing in pleasure. I spent early, with the erotic vision in front of me, I shot cum all over Margaret's back, and then made Louise lick it off, which was just one of many highlights from that night.
However, as we composed ourselves for sleep, Helena explained to the twins that this would be the last time that they would enjoy this sort of pleasure with us, that my mission to prepare my sisters for the Season was ended and that she was re-taking sole possession of my attention, at least until my marriage.
There was something in the way that Helena said this, that suggested I would be wise not to argue with her. After all, while I had had a most marvellous series of adventures with my sisters, it had only been intended that I prepare them for their future lives and it was never supposed to be a permanent arrangement, the only permanency was my mother's and hers alone. For a moment I sensed that Margaret and Louise might also be tempted to argue with her, but neither of them said anything, which seemed to be another very promising sign of their new maturity.