All of these come from this guy:

https://www.pixiv.net/novel/member.php?id=9586695

He also has written a few non noteworthy short "transformation scenes."

”満月の夜" A scene where a wolf boy looked at a full moon....and became a girl.

"小2の男子が女の人にされる" Two boys became girls.

"コンビニ店員がムクムク女性化する" Two convenience store employees become thick and fleshy girls.