in all honestly it depends on what type of vibe it is.. obviously if its made for inside of her.. then yes she is going to have some issues the first or second time.. but after that her hymen should be broken and she'll be fine..... but just give the girl fair warning so she doesnt think she's done gone off and killed herself with a vibe the first time she gets a bit frisky....

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Fantasy is only as as fake as your body wants it to be.