It should be a crime to be impotent and cowardly enough to not "attack" a girl for an entire night after they show you something like this. He's not qualified to be a man. Just use a condom, what's the big deal, you've pretty much accepted her as girlfriend/future wife already anyway and parents on both sides are fine with it, or rather, her mother is totally egging them on.
I feel like not satisfying her is just cruel and selfish more than anything else when things have reached this point. This isn't my libido talking, it's my common sense.
Well, I guess that this author just doesn't want that to happen since it'll be another type of manga then... But he could at least do some fondling and stroking and just avoid penetration, it's not as if he hasn't done that before anyway.
And don't give me the whole "but they were interrupted just as he was planning on doing it!". No, he would've just fondled her at best. Anyway, that's no excuse at all to not just go right back in and get back to it after shooing the people at the door away. She's not going out of heat anytime soon.