fisherman's best friend
Fisherman's Best Friend is a sexual act when a person has a couple of Fisherman's Friend lozenges and then performs cunnilingus. Simply cunnilingus with Fisherman's Friend. The person performing the act could be referred to as fisherman's best friend.
He had a Fisherman's friend and proceeded to eat her out. It was nice and minty and she considered him as her 'fisherman's best friend'.