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Many, many his works... Can find there and some here too at https://www.asstr.org/~jsmt/ Susan’s Procedure, Identity Theft, Youth, Visa 1HB, College Admission.. are good the best in my opinion, but all are the must to read.
Check out the author Anonymous-046 and Jukebox. jsmt has some solid, solid stories for IQ drop too, so I would definitely recommend this again. Otherwise, most bimbo transformation stories have IQ drop