I don't buy it. I've banged chicks at parties, the typical 11pm - 11am+ ones not these childrens parties you're speaking about. The idea of "chilling" with the girl I've just banged for 2 hours in a spare room of a "packed out" party just seems weird.
You bang and then you go party/drink/smoke. You don't stay holed up in a spare room. To do that twice in a party from 8pm to 4am I just don't buy it. We have all had marathon sessions and multiple nuts bust, usually in the comfort of our home or a hotel, not 7 times in a party my dude.
I would have respected this story way more if you smashed both within 20 mins and had a great time at the party after or took the second chick back to your place.