First off:
I absolutely love all your games, Tlaero.
I played through GtkC, all the Keely games (three, if I remember correctly), and now Coffee for Keisha.
To be honest: there is a serious battle going on between GtkC and CfK in my head for number one game of this type.
The addition of sound seriously amped up the experience for me in CfK. Sound offers so much more than just one more sensory input. It adds more than a mere 20% (if we take 100% as being all five senses involved). And until touch, smell, and taste games have been implemented the two senses of visual and sound remain the main info I get to stimulate my mind (and possibly, other areas, hehe).
Thats why I plead to all developers: please please please add sound to your games.
It just gives me such a massive kick to hear a moan, groan, grunt, or whimper from the game than just seeing it being described.
As I am single and living alone it does not really matter to me whether the sounds are loud or not (I play via headphones anyway)
Please keep up the sensual and slow advances. Anticipation is so much more erotic and sensual than just going for the muff dive (so to speak).
That being said and done: keep up the good work.
P.S. I turned off the auto-advance, too, even in my recurring play-throughs. I might try it once more with the auto-advances turned on.