ACOF/Alexis/MomnDad/Hide/Box
You're too curious about what you saw to ignore it. Your mother was locked in a box at the foot of the bed. Was she like that all night? How is that even possible? Once they're out of the room, you sneak over to the box.
Inside is, as you saw earlier, a sort of metal seat kind of like the seat of a bicycle with an adjustable height. The seat has two metal prongs sticking out of the top of it, cylindrical shafts with rounded tips. At the back of the box is a pair of metal disks.
The two metal shafts... your mother had these inside her. Possibly the whole night. Along with the long rubber one in her mouth.
You decide you have to know how those two metal ones felt, at least. You don't plan on using the rubber one, but the metal ones look like they would line up well enough with your pussy and ass anyway.
You look around the room and find a bottle of lube and use it on yourself and the two metal rods.
You take your pants off and squat down until you feel the tips of the rods against your entrances. The one at the back is larger than anything you've had in your ass before, so you plan on taking it slow.
As you start to lower yourself onto the rods, something happens. You feel a shockwave, like a bomb has gone off nearby but it doesn't affect anything physically. Nonetheless, you jump at the shock of it, you slip, and fall onto the rods.
Suddenly they are buried halfway inside you. A sharp pain radiates from your stretched anus.