Apparently K isn't a popular letter, I also didn't find many good ones in this list.

Kala’s Conditioning - Not sure why, but I didn't entirely like this story, perhaps because it's a nice/good person being abused instead of an asshole.  Still, parts are quite hot.
Karina - A very nice hot little story that reminds all us MCers to make certain the rules on adding new slave's be carefully explained and enforced.
Kari’s Awakening - Pretty straightforward, but has it's hot moments.
Karma Dog - This one was a lot of fun, I enjoyed it thoroughly as it's not your usual story.
Kat and Mouse - This falls into the messed up category, it's a story where MC gets a bit dark but the good do win in the end.  Well done.
Katie’s Promotion - Always make sure the subject of your MC potion take the WHOLE potion.
Katy Becomes A Whore - Predictable but quite fun
Keep Myself Awake - Evil little story, I think I'd have cut the arm off but something tells me that wouldn't solve the problem.
Keeping Up with the Joneses - If you EVER see this sort of thing start to happen.  MOVE immediately and as far away as possible.  The ending to this story was probably the best possible, I can imagine FAR worse.
Keeping Your Man Happy - Yes, keeping your man happy is VERY important
The Kidnap Show - Definitely has all the quality of a late night public access show(ok, QUITE a bit more than that).
Killing Me Softly - A very nice premise for a story, I enjoyed it.
The Kiss - Some hot and evil pet action.
Kiss and Tell - Short, but hot and a bit fun
Kitty Kat - A fairly fun cat transformation story.

There aren't a TON of entries here so I decided to do them all in one shot. 

La Bandera Bella - Language tapes, another great place to subliminally train your future GF.
Labor Day’s for Working Girls - Some people are just too suggestible.  I need to know more of these people!
The Lampmaker - I enjoy stories where people are actually smart, where there is a plot and I don't see the outcome immediately.  This one was just that.
A Lapse In Memory - Not a bad story, it's odd getting parts of a story that only come together at the end.
The Last Bridge in Pittsburgh - A fun read which surprised me as magic cum isn't exactly new
Latter Day Sluts - Now this is a religion I could get behind, into, I would certainly cum to a few prayer meetings.
Lauren - Nicely wicked, I like how this one was written.
Law of the Jungle - Wonderfully done revenge scenario, definitely worth reading.
A Lazy Afternoon - What's more fun that playing evil games with friends... Getting to do it again and again...
The Legacy of Mr. Brooks - What do you do when you inherit MC drugs and slaves.  Not all of us would do as well as this man did, I guess there are some of us with morals.
Less Than an Hour - A nice story where a woman is broken.
A Lesson for Laurel - Turnabout is always fair play with gold diggers.
Lessons (Pan) - An old favorite, changing someone while they're helping you do something they wouldn't normally do.
Let No One Put Asunder - it's good to see an abduction story where the husband doesn't end up crushed but wins in the end.
The Letter (a.k.a. A Cop’s Revenge) - Not bad, not amazing
Leveling Out - Hmm, not the ending you might expect, but definitely hot
Leveling the Playing Field - A VERY hot revenge story with just the right amounts of sadism, sex, and fun.  Well done antiwidow
Lewd Dude and the Nude Prude - Some excellent MC based humor.
Liberating Libby - Fairly traditional subliminal transformation but not bad
Lie Berries - This is revenge, pure and simple and you end up feeling sorry for both the people involved but it is well written and hot in places.
Life Imitating Art - A nice story about a good guy who discovers he can sculpt reality.
Life Is Good - Sweet and simple, life is good.
Life, the Galaxy and Everything Else - I skipped a few hypnosis based stories, this one was not one of them. Not a ton of sex but it was fun
Light Up My Life - This is the kind of breakthrough that I need, VERY hot.
Like Mother, Like Daughter - Sometimes the deal we make with the devil isn't the right one, but the one we need.
Limits - The start of a series by Pan where a brother corrupts his sister, her friend and his mom.
Lindsay’s Story: Amphetylcholemine Hydropyrinase-5 - in some ways reading this story is what I imagine it is like to be on drugs.  Bizarre yet still hot in odd ways.
Lingerie - I REALLY liked this story, MC Writer did a great job of describing a situation I could imagine happening.
Lingerie Party - Simple, enjoyable MC.  Good fun.
Lip Service (Trent Wolf) - Definitely the sort of hypnotic session more than a few women need.
Listening to Jack - Not bad, pretty standard stuff
Little Goody Two Shoes — A Shoes to Fill Story - Hmm, I think these shoes may actually be overkill, but I'm not sure anyone else would agree.
Little Helper - Now there's an angle I haven't seen before.  Very fun.
A Little Knowledge - When casting spells, make sure you know what they'll actually do.  When enacting revenge, make sure the person can't get back at you.  Fun and funny :)
A Little Pink Camera - A little fun, a little bizarre
Little Taste of Me - MC cum, nothing majorly new, but works for me.
Logic Dictates - A little MC, a little persuasive argument, a lot of fun.
Logical Fellatio - There has to be some logical reason these arguments don't work but I cannot for the life of me see them.
Long Day’s Journey Into Susan - Even MCers can be good people.  These are some of the BEST, and there's hot sex.
The Long Road Goodbye - Not at all what I expected, I enjoyed it.
Look at Me - Not bad, the control is a bit simple but it's a good story
Loose Circuit - Yeah, something shook loose in her head.  Nice fire alarm though.
Loose Ends - Another very fun little story by Jukebox.  I understand how the main character feels ENTIRELY.
Loot Box - A very nice use for loot boxes, definitely better than the real things.
Lord Wolf - A fun story about a guy who does a good deed and keeps getting rewarded.
Lorenzo’s Massage Oil - A nice and hot story and even a moment of clarity at the end.  I liked it.
Lost Toys - A long and involved series about a MCer who inherits a couple slave and then starts collecting a harem.  Well written.  Not listed here are 8 sequels.
Lost, But Searching - Evil MC is a hot fantasy, this is what should ACTUALLY happen to someone who tries it.
Lotion Potion - Simple and fun, thoroughly enjoyable
Lottery Winnings - A fun and simple table turning scenario
Lounge Control - Some men should not be crossed, this man is definitely one of them and his revenge is sweet.
Lounge Control — Darcy’s Next - A pleasant sequel to Lounge Control
Love Is The Strongest Bond - Kinda fun, a little sexy, and a HORRIBLE joke at the end.
Love Potion - Not bad, pretty predictable.
Love Potion No. 13 - Fairly standard, I did like the accidental part.
The Love Song of Cassidy A. Wainright - Could have used a bit more sex, but not bad
Love Spell Mistake - Definitely a be careful what you wish for or you just might get it situation.
Love Stinks - Another fun little story by Jukebox
Love Thy Neighbor - A fairly decent table turning scenario.
The Love Toy’s Reprieve - The good guy stories where a man tries to save someone who's been controlled can sometimes be even better than the evil MC stories.  This is a good story.
Lovestruck - No sex here, but definitely the type of school assembly ever good mass mind controller should have.
The Luckiest Girl in the World - Hmm, not sure if she's the luckiest girl in the world or the most suggestible.  Either way works for me.
Lucky in Love - Fun, nothing deep or complicated, just fun.
The Lucky Janitor Theory - Never heard of this theory, but someone is definitely VERY lucky
Lucky Tickets - LONG and well written, plenty of sex and actual character development.  The main character is a bit whiny at points but definitely worth reading.
Lucky Tickets 2: Lucky Stiff - The second Part of Lucky Tickets.  Even longer than the first one and VERY well written.  Not a ton of MC but a good read, the author IS working on part 3, but he has been for quite a few years but published an update recently.  Worth reading even if it never gets finished.
Luxury Pets - Fairly quick and fun, just a sinple transformation story but I like the quasi-humiliation aspect.
Lyra - Middle of the road, but not bad and it was the last entry under L so why not ;)

Modified - Nice conversion story, I'm sure she needed it
Modified Behavior - Nice human to pet story, well done and enjoyable
Mona’s Makeover (Paladin) - A nice slow transformation from frumpy to sexy not a ton of actual sex
Money Shot - Well written, but I'm never a fan of the ones that make a strong point of destroying a relationship.
MOO! - An amusing cow transformation with a good dose of humiliation.
Mood Enhancement - Just a nice safe little experiment here, nothing more. :)
Mood Musak - Yet another important lesson for the young MCer, make sure you ONLY get your intended target(s)
A More Permanent Position - a decent humiliation/revenge story, would be nice if there were more struggle on the victims part.
Morgana’s Day Spa - An enjoyable story with an amusing twist at the end.  The Epilogue is entirely unnecessary but fun.
Morgana’s Gift - Not much MC but an enjoyable story
Morning Heat - A fun little dog transformation hypnosis scenario
Morningview Psychiatric Hospital - Beneficial MC to help the unbalanced, not a bad story but could probably use 1 more chapter.
Mother’s Motor’s Running Hot - I like the prank call aspect.
Mountin’ Biking - Pretty good, needed to be a little longer before the good guys won.
Mr Carruthers’ Garden - A very special garden indeed.
Mr. Bankole - Interesting premise, I kinda like the story
Mr. Dick Head - Ok, I shouldn't have, but I liked this one.
Mr. Poe - Beware of MCers with gifts, they may be more fucked up than you.
Mrs. Arrogant Tamed & Mrs. Arrogant Tamed 2 - Some stories should just be combined into a single entity.  Still, these are both quite hot stories about a bitch and her sister that get thoroughly tamed.
Music of the Night - Loved all the Beatles references and the content.  A shame he never did the sequels he mentioned.
My best friend - Nice hot story, but way too short.
My Boyfriend Is Such a Liar - Be careful about bets made with hypnotists and mind controllers.
My Bratty Brother - Not bad, kinda middle of the road, some decent humiliation.
My Brief Career - Very fun little story about a Mind Controller who gets in out of his depth.
My Car, My Rules - Temptation can be evil, in this case VERY evil(in a good way)
My Career as a Wizard - Not bad, but a bit... mechanical...not sure if that's the word but there's no emotion, just action.
My Descent Into Lesbian Tit Slavery - A very nice lactation enslavement that's pretty hot.
My Favorite Virus - Nicely written, definitely a scenario where things get out of control but in a good way.  Could probably use another chapter or two but I don't see that happening.
My Four Aces - A little love, a little sex, a little MC, a little revenge.  Works for me!
My Imaginary Friend - Ok, I have to admit, I really like his imaginary friend, and both parts were very fun.
My Late Uncle’s Gadgets - Very hot, the machine in this is definitely something I'd want to use on a few people I know.
My Mind Is Gone - Jukebox really is very good at this, VERY enjoyable.
My New Boyfriend - Not sure why but I enjoyed this story, may have just been my mood as the MC was obvious and simple.
My New Career - This sequel to My Brief Career and is wonderfully fun and a good laugh, sadly, there's not really any good sex but very well done D. Holzer I look forward to reading more of your work.
My New Girlfriend (Ice Bear) - An interesting story, where the guy has no idea why the girl is SO dedicated to him.
My Real Estate Career - Sequel to My New Career and My Brief Career, another fun story.
My Sister’s Captive - Definitely working on twisted, needs more parts but was started last year so who knows.
My Wife, the Professor - A very nice story(and an excellent gift) Sadly, unfinished.
My Wife’s Surprise - More husbands need surprises like this :) 
My Wife’s Therapist - Not bad, hate to say it but the husband's kind of a dick and no revenge against the Therapist happens

Mental Security Guaranteed - I want to see the product reviews on this
Merchandise - She makes such excellent merchandise
Mesmer’s Daughters - I believe I've read this story before, the words seem so familiar but it could be coincidence.  A trance based conversion story.
Mexican Fly - A good start, but once again no real finish.
Michael’s New Pets - A nice little enslaved by implants story.  Fun
The Midnight Ride of Paula Revered - A fun little variant on Cinderella
Milk and Honey - Not my usual, but I enjoyed the impregnation theme.
Mind - Incomplete, but well written and quite enjoyable. 
A Mind Apart - Pretty traditional MC, man gets powers in hospital, finds some toys and then things get complicated.
Mind Contagion - I enjoyed this story quite a bit, it could use another part or two but they aren't necessary, it's complete enough.
Mind Control Dust - quick and easy, and ALWAYS make sure your victims have no way out.
Mind Control on a Saturday Night - This is a good story about fantasies fulfilled even if the participant wasn't exactly willing. 
Mind Control Party - Fun story, pay careful attention to the interlude in the middle.
The Mind Control Tales - Kinda middle of the road, his "revenge" isn't that drastic and he's not that evil. 
Mind Field - Not bad, incomplete but not bad it at least goes far enough to be enjoyable
Mind Fuck - This one is just plain GOOD, one of the best I've read in a while.  I'm surprised no one else has listed it as a favorite.  Well done Zebulon it's a shame you haven't written more.
Mind Games - This one's very nicely evil, a voice in her head telling her she's his and gets no choice.  Not sure she'll ever enjoy it but it's MC and that tends to be NC :)
Mind Games (Gingerxxx) - Kinda a rough start, but a pretty good story with plenty of hot MC.  Definitely VERY long.
Mind Wipe - A very playful little story about getting women to think with their pussies
Minor Sexual Sins - Not bad, twisted Philosopher manipulates minds from beyond the grave :)
Miranda Violation - Nicely written and quite enjoyable.
Miranda Warning - Very hot and a wicked ending.
The Mirror (Interstitial) - Careful what you search for, sometimes it finds you first.
Misfortune’s Bracelet - Well written and fun, but as with all magic like this, be careful!
Miss Titus’ Day Off - Fairly predictable, but some good sex
Miss You - No, nothing creepy here, nope, just move along(good story though)
Model Behavior - I enjoyed the body swap, but haughty girl brought low is always a fun subject.