O-kay, it should be interesting to see them all talking and working out guilt and other emotions together; I rather suspect that Ron's neglect of this process is going to turn around and bite him big time. If/when it does, he'll really have only himself to balme since he was offered the same opportunities and declined them. One can hope, mostly against hope, that he's mature enough to see this. The actions seem realistic enough from what I remember of being that age (though time may have dimmed those memories, 'twas longer ago than I care to admit) and I'll echo the hope that the girls have used appropriate protective measures 'cause I doubt Harry's in quit the mental shape, at the moment, to consider those; though I'll reckon he's going to sweat about it when he thinks back in retrospect.
Author's response
Guilt can do funny things to a person. A cheating spouse may suddenly become much more attentive.
A guy cheating with his best friends girl will drop hints and try to get caught. But when it comes time to stop himself he will rationalize his way into having sex with her again.
A guy who feels guilty about neglecting his duty. Will let anything slide so he feels better about himself in comparison.
I am trying to keep it realistic without just having them shag and then feel bad about it, which is what would happen in real life in this situation. It is a little bit far fetched but that is so it makes good reading.