Lipples

Many—perhaps all—of us have nipples that can bloom to become plush pink lips and tongues, called lipples! These particularly soft and delicate lips enable You to fuck a slut’s breast as she sucks You off. (This is often the least messy way to literally fuck one of our hearts. ♥)
  This perk is nigh-universal, available to every slut who even has a chest! For many of us we normally wield conventional nipples, but these transform into lipples either at will, in Your vicinity, or the moment You begin fucking the nipple itself.