6) In chapter 09, during kissy-time, Asuka tells Ayako "if it's hard to breathe, you should open your mouth".
In chapter 15 Ayako said: "Hurry up and open your mouth already."
(Edit: ...oh, while I posted this, shialzsan also noted that .-. )
Amusing, right? XD
But I don't think we should believe Ayako didn't know how to kiss at that point in time, and learned from Asuka during those few minutes of kissing.
I think that, in chapter 9, Ayako was trying very hard not to respond or react in any way... and ended up in a totally dominated position, lol.
Ayako, being forcefully attacked by Asuka, did her best "dead fish" impersonation and tried to remain still and unresponding (a classic cliché for Japanese women during sex, if urban legend is to be believed) but she didn't expect Asuka would be so good at it: she got crazy turned on and started responding as a natural reaction. Then they found themselves in a situation where Asuka had taken the dominant role as a matter of course, while Ayako was merely responsive; and when she wanted Asuka to stop she had to beg for mercy, lmao.
In chapter 15, everything was different. Ayako went all-out on the attack (for reasons that have been analyzed plenty already) and, as one would expect, she has truckloads more experience than Asuka. Asuka was caught by surprise, and, this time, she was the one being put in a submissive role. And the stimulation was so extraordinary she ended up getting scared, haha. It's not so strange: Asuka is a horny teen, but she's also an innocent virgin! Also, she detected something was weird: Ayako, as Asuka knows her, was not being herself the way she was acting.
Anyway, it should be obvious Ayako doesn't need to learn "how to kiss" or "how to sex" from Asuka.