Resized to 70% of original (view original)
Artist's commentary
Back-to-back stretching
He stepped on the hems of her pants in order to slip down her pants (the panties coming down too were beyond his expectations).
This underclassman is now completely exposed in front of the boy she likes.
On Ci-en this illustration is available along with a simple story (anyone can read it)
https://ci-en.dlsite.com/creator/4565/article/371999