The thing about this quest is that the title is ironic. You don't remember last night, and that's when all the debauchery happened. Now you're retracing your steps and fixing your problems. Judging based on the amount of empty wine bottles in Morvunskar, you did have a pretty epic party with Sanguine. You just can't remember it!
^
ThisYou know, I carried that thing around for weeks and never actually used it. I suppose it would suit a mage character best.
I gave it to my follower and fun times ensued - not to mention a helluva lot of chattiness with a follower, the Dremora and Lucien LeChance all together.
Never say "rectified" or "rectify" when Sanguine is around.
I cannot help but think of The Hangover Part II where Stu has six with a Ladyboy and he/she tells him about how he [censored] [censored] [censored] while Stu [censored] on the floor. This is why you should be
glad you don't remember what you did that night.
Polite evil is a more dangerous evil. Politeness can put someone off guard unlike someone yelling, swearing, and threatening you. Moriarity in the latest Sherlock Holmes movie shows this. The way the deadra talk remind me of european aristocrats of the 18th century. All proper yet callous of those "beneath" them. I view Sanguine like the Marquis De Sade or Calligula. He maintains an air of nobility while he indulges in anything that interests him and if anyone else gets hurt to bad, not his concern.
I think of Sanguine more as Bacchus. Affable, self indulgent and undisciplined, but certainly not anything crass, since he also has an artistic sensibility. The dangers to the player are his capricious whims which have no boundaries, and that he has the capacity to infectiously sweep you along for the ride. Sometimes the most evil thing you can do is take the path of least resistance.