Starting with the introductory first round of questions:
a1. Who are you in general?
I've been trying to make a go at all sorts of creative stuff for years (writing, drawing, animating, game development) without making much real progress; and the whole time I was secretly relentlessly horny under the surface. So recently I decided to give a try at releasing some of that energy in a productive manner, made my 'Zalzup' account, and have been enjoying the ride ever since. I also have, for whatever reason, been more consistently productive with this NSFW stuff than I ever was with even my favorite SFW works.
a2. What inspired you to start drawing hentai?
Horniness. I have a few somewhat niche fetishes, and have always been highly dissatisfied with the low amount (and often quality) of content to satisfy said fetishes.
a3. What kinks/fetishes/styles do you specialise in?
Breathplay is my main thing, especially smothering (that is, covering the nose and mouth), as opposed to strangling or drowning (probably the two most popular types of breathplay). I also have a huge glove fetish (especially latex) and love just about everything BDSM, so that stuff is in there as well. The other major thing is I love a good non-consent fantasy, so a fair amount of my works contain kidnapping, rape, and death (by suffocation of course).
When I started, I wanted to make a semi-self insert character I could use as the victim in all those fantasies; and so I made one and named him Victor Timm (Vic Timm, haha). I've given him a 'canonical' storyline over time, with a loving girlfriend dominatrix who gets up to all sorts of fully consensual breathplay shenanigans with him (and those two have comprised the bulk of my work so far); while still putting him in some non-canon scenes with other characters every once in a while. I also have been creating a few other settings and characters to play around in, including a genderswapped version of Vic that I plan to make a visual novel kind of game about (with magical, BDSM, Lesbian pirates); and my most popular so far, an order of sinister rubber nuns called the Sisters of Disposal who work as kidnappers, assassins, torturers, and more for hire.
a4. Do you plan on making a career out of your hentai or is it just something to do on the side?
I've made a bit of commission money, and want to open a subscribestar or something soon, so I would love if this turned into a small career, but we'll see.
---------
And then, the second round of questions:
What is, as an NSFW artist, the:
b1. Worst Experience
I haven't had a lot, but I do hate dealing with all the self-promotion management crap that kind of needs to be done. I still haven't finished setting up my twitter for sharing my art.
b2. Best Experience
Early on I made a friend with another artist over on DA who I've been a fan of for years and who really liked my work. He's been pretty awesome, so that's been nice.
b3. Most Interesting Experience
I've had nearly identical messages from like 6 'different' accounts (mostly on DA, but a couple on Pixiv) who all have the exact same request for 'a pillow smothering scene where the woman doing the smothering and the victim are both barefoot'. I'm not hugely into pillow smothering (most pillows are too breathable for that smothering sensation, as well as you can't see or feel the smotherer through it), but I did draw one like that early on. It's a pretty well liked piece, and I don't resent people for having really specific wants, but they still keep asking for more of it. We'll see, maybe someday I'll make more (maybe someday they'll decide to commission one, if it really is multiple people they should team up for a group commission to spread the costs).
------
As for the newest question (best tits in a normal movie), I honestly can't think of a good answer (although I'm sure I have one somewhere), I don't watch a ton of movies, and most of those don't have much in the way of exposed tits.