Your possessed by some outsider, angel, demon, devil, janii etc, which gives you some small bonus once a day in exchange for dominating you for a few rounds a day. Idea from an item my DM made, a helm that dominated the player once a day to do some kind of chaotic action, in exchange for getting an extra standard action (4e). Build something up along those lines, have the party witness you under the influence so to speak, and then have to work your way free of it.
Another idea, this one ripped straight from the pages of Forgotten Realms lore, is to have your lycanthropy be an even greater curse then it already is. Make it like the curse Kelemvor had, where every time he committed a selfless act (something without a material benefit for him) he turned into a panther until he killed someone, or some amount of time passed, can't remember the exact untriggering. That would be another fun way to have the party meet up with you, perhaps change the trigger event, something purely for profit, a deed that was pure good/evil/law/chaos, committing a sexual act
etc. The possibilities are endless