He's stuck inside a pair of panties, and can't tell where exactly he is. He's disoriented, and doesn't know which way is up, and which is down. Jeff stays put, not wanting to go further in by accident. All he can smell is fresh clothes.
A hand reaches in, picking the panties out. He stays attached to the bottom, trying not to fall as he looks at who's holding him. Lily, again. She's naked from last night, as she had an emergency change out of her panties, and her bra was, well, Jeff.
The girl quickly put the panties on, being out in the open and not wanting to be seen. What could've eventually ended up as his sister-in-law had him trapped in her panties once again, even despite last night.
Lily put on the rest of her clothes, not aware of the 16-year-old boy she has sitting in her panties for the second time, and moves on with her day.