pp oppai

It is when the nips can be as big as a baby's or adult's penile.

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pp oppai (long version, translated); Penis Penis Breast
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Mostly found in women and kinky hentai / doujins / possibly porn too
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Be aware, who ever likes these kinds of things are a total perv.

P1; Did you hear?
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P2; Hear what?
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P1; Your seatmate is so~ into pp oppai.

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P2; Really? She must be cool and perverted.