Bobbi Pavis, Barbara Horan, Jeana Loring, etc - The Malibu Bikini Shop (1985)
The video store around the block from my house rented this to me as a 4'th grader.
There were more scenes than this, there were a couple more parts where the one brother got to keep watching a lot of them changing through a two way mirror. One part lead to a fat chick and he was grossed out. lol
I didn't know then it was going to be a voyeur tit video. It was a funny cheesy 80s movie all the same though.
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None of the links I post are mine.
Susan Dey and Terri Welles in Looker is probably the origin of my hypnosis fetish. Their blank stares woke up a part of my six or seven year old lizard brain that just continued to grow and become something that has stuck with me for my entire life.