A surprise in the middle of the night

We've been asleep for a while when I start having the most vivid dream. I'm lying in my bed and Hallie is impaled bouncing up and down on my dick, as Jenny sits on my face. I'm licking the blonde's pussy furiously, as the redhead rides my cock for all she's worth. They're both screaming in pleasure. "Mr. Dan! You're a sex god!" Not the most realistic thing for them to say, but whatever. It's my fantasy.

I've had plenty of dirty dreams about my daughter's friends before, but it's never felt like this. It's like I can actually feel Hallie's pussy wrapped around my cock. That's when I hear a voice that is definitely not theirs say "Wake up, Dan". The girls have vanished, but I can still feel something hot and wet surrounding my dick.

I open my eyes to the darkness of the room. I look down and see a head full of dark hair bobbing up and down on my cock. Megan must have woken up and decided to get started on round two. I lay my head back down on my pillow and revel in it. After a few minutes, I suddenly remember that my sister is sharing the room with us, and I look over toward her bed to make sure we haven't disturbed her, only to find it empty. As odd as that is, I can't bring myself to give it much thought, as my wife is giving me the most magnificent blowjob I have ever received. Just as my brain is about to melt completely, I feel a hand brush against my shoulder. I look over and see Megan sleeping beside me, exactly where I left her before I fell asleep. Wait, what?! If Megan is still asleep, then the person who's sucking my cock so expertly could only be...

"Becka?" I say just a bit too loudly. Megan groans in her sleep, but doesn't wake up. I look back down just in time to see my sister take her mouth off my dick and hold one finger to her lips. "Quiet, Dan. You don't want to wake your wife." She whispers with a wicked grin on her face. As I'm trying to process the fact that my sister is the one who's been sucking me off, she goes back to doing just that. I don't know where she learned it, but her mouth is like heaven.

All of the sudden, she stops and sits up. That's when I notice she's completely naked. "I hope you're ready for the main event, big brother." She whispers, as she climbs on top of me, straddling my legs.