Lydia decides that last night took more out of her than she thought, and that another few hours sleep would do her some good. Smiling, she gets up and walks back up the stairs to her nice, cozy bed.
Every step grinds flesh against you against more flesh. Though her skin is softer than you thought possible, the pressure is horribly unpleasant, and you struggle to breathe with every small gap between steps. When she reaches the stairs, each step gets longer, and you are dragged back and forth in between her cheeks, briefly getting glimpses of light as your head breaks free, but then getting rolled back in deeper than before. You curse as her last step up leaves you pressed right up against the darkest part of her pale ass.
Lydia could swear there was something pressing up against her most private hole, and absent-mindedly reached back to scratch it, thinking it an itch and nothing more. You get an ounce of hope as you see light, and Lydia's hand coming in toward you until you see it's only one finger. "Oh, crap!" The finger presses into you, and rubs you up and down against her anus, practically flattening you against it. When it finally leaves you be, deserting your canyon of a prison, you find both of your legs forced knee-deep inside Lydia and the rest of you flattened into a wrinkle above it, her cheeks still grinding, keeping you steady. You can do nothing but wait and hold your breath. At least it doesn't smell too bad...
Content with the itch leaving, Lydia pulls her hand back out and hops into the messy, unmade bed, pulling the thick down comforter over her, and cuddling up against the soft, silk sheets. As her head hits the pillow, her eyes shut and she is quickly asleep once more.
For you, the jump is alarming, your stomach lifting like you were on an amusement park ride. Something like the Tower of Terror. Then suddenly you stopped falling and slammed back upward, freeing your arms and head from Lydia's anus. Finally, the world stopped moving and you had a moment to catch your breath, reforming slowly. You are able to pull your torso free, but unfortunately, as your legs stop being flat, they become much harder to pull free, and you find that you are as trapped as ever. Pushing against her with all your might, you struggle, making little progress when you feel Lydia shifting. You freeze, worried what she's doing.