I imagine this delightful act of pleasing eachother is one for well established couples, good communication etc. The thing is... while receiving an act of pleasure I have experienced that my partners are often highly absorbed in what they are doing. Thus any reciprocal gesture at the same can often put them off course: viz a viz, it's either my turn or your turn.
So, any intros, punchy one-liners or is this one for my Christmas wish list? : 
i found just communicating what you want always works. if your going down on him for example say something like "i want to feel your tongue on me while i taste you" or something. not a great example i know but you get the jist. thats a huge turn-on for me if my girlfriend says something like that. i know i find it great to be able to please my girlfriend at the same time as shes pleasing me. i find its still easy enough to reciprocate while being pleasured, its something that just seems to come naturally to you in the moment. but everyones different so what works for my girlfriend and i may not work for you but then again it may. never know unless you try.
Oh by the way, I'm a very potent young male, just going by a funny kind of Scottish conundrum - which ends up as a girls name! Try working it out if you can. Anyway, your suggestion is of course the more obvious stepping stone. I'm just not a great talker during play-time. My girlfriend is much more straight and to the point whereas I take days to vocalise my more intimate questions or intentions. I write much more effectively by mail and can afford to be more cheaky or downright horny. But there is a great distance between such a perfect world and the here and now. We are still early in our relationship so we are even still discovering alot of nice surprises. I would just like to actualise my wee wishlist.
It's kinda funny that we are still inhibited about asking for things when we are at are most "exposed", so to speak. When my husband and I are fooling around, I just tell him what I want. Being a clueless guy, he's more than happy to get suggestions.
If he's already going down on you, you can pull his body towards you and start sucking. Easy as that.
However, I do agree that it's a bit distracting to enjoy being eaten while engaged on something else. I have problems cumming during 69. I consider it extended foreplay.
Sandy
I find 69 awkward, and it is very difficult for me to focus on the penis in front of me when my boy is pleasuring me. One at a time works best for us.
Nice reply, thanks! This user name of mine is causing lots of confusion. I'm still a potent young male!
I like what you said about being at our most exposed and still being shy to ask for something which will/should only give my honey some added extras, while doing this lovely thing to me. But how do I move her into such a suggestive position?
Just say "Honey, scoot over here and have her bring her body around to you". We are both lazy so we usually do 69 side by side.
Thanks all for your suggestions and replies. I'm offski on tour and then going to see my honey, so I will be putting a few new treats into practice!
although just suggesting straight up is the best way to go, another way would be to get your self in an inverted position to her while licking and kissing your way down her body. At this point start going down on her, and since your penis will be right there, she will probably just go for it automatically.
Hi
Im very inexperienced in sex, and the first time that my boyfriend and I 69ed, he initiated it. He just went down on me, and swung his legs around, so his penis was near my mouth. We layed side by side, and it worked...but I do find it a bit akward. I'd rather do one at a time, like was mentioned earlier. Good luck!
69 works best for us when he is laying on his back and I get on top. Not only does it allow me to have control over giving him pleasure, I can angle myself to where it feels best on me.
as delta said its awkward to say the least like doing one at a time when we first make love and after we are worn down like 69 then just taking our swet old time not caring if we cum or not just the pleasure of feeling and pleasing each other we lay there some times go to sleep,but its there