Kaos Softwear makes the Heart retainers flexible and comfortable. These are made of implant grade silicone (only manufacturer on the market that does). These pieces are also ideal for sports and swimming, they are light and feel as a second skin.
On top of all this, they're available in 7 taint colours!
This way you can hide your piercing, no one is the wiser. The heart is on the back so you can insert it with ease without having to fiddle with threading or closure of any kind.
Get a colour that's slightly darker than your own skin. This makes it look like a little beauty mark. this works exceptionally well on Madonna Piercings and Nostirl Piercings.