Downstairs I find everyone "sleepwalking"

I sat there on my bed, wondering for probably the hundredth time what exactly was happening here, the numerous strange events piling up in my mind so that I couldn't think clearly about any of them without my mind jumping to the next event. I was dazed by the strangeness of everything that was happening but what Stacy had just said kept echoing in my head. Why don't you come downstairs and find out? She'd said in the strange drowsy way of speaking that only sleepwalkers had as she climbed off of me, ambling out of my bedroom before I had a chance to question her futher. Needless to say, my curiosity was piqued as I scrambled off my bed in a hurry, grabbing my boxers as I followed my somnambulist sister down the stairs. I paused on the stair landing to slip into my underwear, trying to tuck my still hard cock futilely into my loose boxers. I marveled briefly at my stamina, I had just had sex with Stacy, coming twice and yet I was still hard, hell, I was even harder than I had been when she first woke me up. Yet another mystery to try and figure out, I mused as I hurried to catch up with my oldest sister.

"Who is we?" I asked Stacy once more as I caught up to her at the foot of the stairs, questioning her again about her cryptic statement in my bedroom. "You said 'We thought you'd enjoy your birthday present, but you didn't tell me who we."

"Phil," Stacy stopped at the door into the living room, turning to look at me with a sleepy sphinx-like smile as she slowly pushed the door open. "We is all of us," she tells me, holding the door open to reveal all the women in the house either sitting or standing around the living room in various states of undress.

"What?! How?!" I stammered in shock as I looked around the living room, my eyes wide as I noticed that they were all in the same strange 'sleepwalking' trance as Stacy. "What's going on here, Stacy? Why are all of you like this?" I asked, wondering if my sleeping older sister's subconcious would answer me.

"Only you know that, Phil," Stacy replied egnimatically as she ushered me into the living room. "Only you know why this is happening as you are the one causing it," she explained simply, leaving me with more questions than answers.

I opened my mouth to ask another question but found myself speechless as I looked around the room at the sexy sleeping women that seemed to be somehow under my control. I knew I should try to figure this out, to think hard and try to solve these mysteries, but seeing all that comely flesh displayed around the living room, my more carnal side took over, my lust pushing any concerns to the back of my mind as I surveyed the sleepwalking woman in the room. The only thing I was thinking at that moment was who I should start with...