There is a lot of misunderstanding out there about BDSM, and it looks like you have a prime opportunity to clear some of that misunderstanding up for some people.

First of all, kink is not abuse. Nothing happens that isn't consensual. The one thing 50 Shades got right was the contract, even though it didn't go too much into the details. Yes, that is a thing. In addition to contracts, there are "hard limits" and "soft limits". A soft limit is something a sub/bottom is timid about but may interested in or at least not opposed to, while a hard limit is basically the sub/bottom considers a no-no. These limits are made clear, discussed, and are usually part of the contract.

Kink is also a spectrum. Some couples just engage in some light bondage or spanking on occasion to spice things up, and others think of it as a lifestyle they live 24/7. Some subs have no submissive tendencies outside the bedroom (I know a sub who is a highly driven, domineering project manager in her day to day life), while others let their Dom(me)s go so far as to tell them what to wear and when and what to eat. Then there are top/bottom dynamics, in which there's not so much of a power exchange as in a Dom(me)/ sub relationship.

To give a little bit of a personal example of the kink spectrum, I am both kinky and poly. I am a Dom, but the D/s aspect of my relationship with my sub (who is also my best friend) doesn't extend far beyond the physical, and to the extent that it does, it's pretty much just kinky flirting. Sometimes, if she feels like playing around with some role reversal, I let her top me (meaning take the dominant role, although not to the extent I do with her). We also have a triad type relationship with another woman, and while there may be some playful spanking and light bondage and even some topping and bottoming going on, when the three of us have sex, it's as generally just about as vanilla as a threesome can be.

The final thing, and something I think is very important to mention considering the age group of your audience: There is a huge difference between 'dominant' and 'domineering'. This stems from what I said about kink not being abuse, but it goes a bit further. I have seen a number of self-entitled Doms (usually young and almost always male) being downright disrespectful and even cruel to their subs, to the point of actually being abusive. I know of subs who have been given 'assignments' (in this case, sleeping with nipple clamps on) that would cause permanent nerve damage. I know of one guy who told his sub to get breast implants; he didn't suggest it, ask if she'd ever thought about it, or even offer to pay for it, just told her to go out and get cosmetic surgery she didn't want and was upset her response wasn't "yes, Master" (it was "get lost", by the way. Also, she has beautiful, natural breasts). I've seen abusive men exploiting the term Dom to pray on inexperienced subs.

To be a Dom, to be dominant, doesn't mean to dominate; it means to control. A good Dom(me) is in complete control of a scene. First and foremost, that means being in control of one's self. It also means being in control of the situation -- being responsible for and cognizant of my sub's physical safety; knowing her well enough to recognize, even if she doesn't, when to stop pushing a soft limit; attending to her aftercare, giving her encouragement, and being tender with her when she's coming down from a scene. It's only when I'm in control of myself and in control of the scene and fulfilling my responsibilities as a good Dom that she can fully surrender control and submit herself to me; it's only then when her fantasies can truly be fulfilled.

In short, a good BDSM relationship (even if the relationship is only in the bedroom/ dungeon) isn't about bondage, discipline, dominance, submission, sadism, or masochism; those are just the methods. It's about openness and communication; it's about comfort exploring one's passions and comfort with the person you choose to explore those passions with; and mostly it's about trust. So pretty much, it's no different from any other good relationship.