Kinktionary
More like guidelines and a lot less like definitions.
Corruptor
Role fits: any gender
In the context of kink it is someone who derives pleasure and arousal encouraging and facilitating a vanilla or otherwise less experienced partner to do sexually kinky or taboo things. Done consensually this dynamic doesn't come from a selfish or malicious place, but rather from the joy of sharing in another's sexual journey. For example, an older woman or "cougar" teaching a young "cub" about sex.