You can get your partners name tattooed, and don't have to worry about removing the tattoo, if your partner changes!
If your skin is sensitive, get an allergy check done before trying any tattooing methods. Apply a little line or patch of ink on your skin, and let it sit for an hour and then check for any allergic reaction.
Going for a tattoo using a tattoo gun will cause discomfort and there is no guarantee of complete removal. Hence, it is safe that you stick to any of the above mentioned safe temporary tattoo method, to get a body art design. Good luck!