I'm getting this one in right under the wire at the end of KOTW!
I do not think of 69 as a kink, but merely doing oral sex on each other at the same time. My Master enjoys it, but for me I would prefer many other types of sexual pleasure. It's not my favorite.
When I'm sucking him, it gives me a ton of pleasure just to be pleasing him (this was learned, not something I came with factory installed). Any licking of my bits is only distracting and I can't enjoy it. It's like being hugged while you are in the middle of trying to perform a difficult and important piece on the piano. Just wait, ok, hug later? I'm enjoying my piano playing and this hug is totally throwing me off my game.
I don't know why, but being fingered or using a vibrator while I lie on my side are not the same level of distraction for me. I love experiencing those while I'm orally pleasuring him. I can't explain this, but it may be a mental block thing. I also don't like being on top when I'm receiving oral, and this is almost always the way we do 69, so that may be a lot of the problem for me.