Um, be careful. There are site rules to contend with...
I love the description of the D/s dynamic there and what it means to her. Powerful thoughts on power exchange.
Oh, I was SO hoping we'd go there!
I'm going to let someone else take this one, but please, please, make it a really good one!
I'm not entirely sure "comfortable" should ever be the correct adjective for a butt plug. I'm not suggesting they're supposed to be painful, but inserting anything rectally is an unnatural act (that is not a value judgement, mind you. "Natural" is not always good - lightning, earthquakes and cobra venom are all natural, after all).
That said, there is probably a plug that is less uncomfortable for you than the present one. But you also might benefit from advice on inserting it. The best I can offer is that when it's going in, you should try, paradoxically, to bear down, like you're trying to "go." That, and as much as possible, relax. If you're nervous or dreading it, then it's going to be less comfortable.
I often wonder what posts like this are intended to elicit. It seems to me you're going to get n different responses with n different answers. BDSM can be grouped into broad categories, but everyone picks and chooses the bits of each kink to make up a lifestyle that fits them and their partner(s).
But I won't just pontificate without answering your question. I am a D/s dom in a monogamous relationship with my sub, who is also my wife. Our kink revolves mainly around control, with a healthy dose of spanking and a sprinkling of bondage.
They don't really approve of linking to other sites here in the lush forums, but I will suggest that you consider joining FL if you haven't already. It is, so far as I can tell, the best Internet BDSM community around. I say that because its focus is NOT on matchmaking or anything of the sort. It's a way you can connect with your local BDSM community, and by doing that you stand the best chance of finding the dom you seek.
Anyone who doesn't recognize the site from those initials can PM me and I'll give you the full name.
Since I predominantly prefer to spank, I'll change "whip" into either "strap" or "cane." Whips I associate with targets other than the bottom.
I prefer sting to thud... welt to bruise... but that said, you can effect a proper punishment in far fewer strokes of a good hardwood paddle, if that's your aim.