Honestly, the actions themselves line up if you think about her personality and what she would end up doing if he suddenly changed his actions so aggressively.I guess because it does not really line up with Ayane's character. For all the flirting she does, she's pretty shy and it doesnt make sense that she decided to give Sensei a BJ one day randomly.
I don't think the entire scene needs scrapped, the main thing I think it needs is a change in dialogue so it flows more in line with their personalities is all I think that needs to happen.