So far, there was no wake up meter for Kaede, which led me to believe, that she is very devot and actually into it/you. I think she even opens her eyes shortly when interacting with her and only pretends to be sleeping. She is happy to get any attention and doesn't mind to be used as fluffer or when you go back to the bed with yuna (she is so supportive lol). It would be hot, if there was a minigame around Kaede: Giving her pleasure, makes her moan, which in turn slowly wakes up Yuna. Head patting doesn't help, but letting her suck on a finger or gagging her otherwise could. She doesn't mind you doing whatever to her, but if you do it too much, she can't keep quiet and orgasms, or smth like that. Her (relationship-) progression Could be, that she feels more comfortable with letting you know that she is awake and horny for you. She might even start masturbating, after waking her up/turning her on, while you interact with Yuna, inviting you to do some more to her (opening mouth and sticking tongue out, spreading pussy, begging etc.).
I also hope, that you expand the reactions and facial expressions of the ladies to be not always the same and more nuanced. Seeing their tits wiggle while you do things is one thing, but for me it's hottest to see them feel the lust. (Remember feel the flash - Kasumi??) Seeing Kaede trying to deal with you pleasuring her, but it gets harder and harder until she is overwhelmed by lust would be sexy... even whispered dialogue could add a lot of excitement..