@ZeroWWE just trying to fool himself dude. He knows they want to bang, he's just trying to fool himself that they're joking so that he could leave without any regrets.
@ZeroWWE Well, seeing his childhood friend who obviously has the hots for him turning him down when he suggests she's fallen for him...do you blame him if the females in his life prior to that always sent him mixed signals? :/ That and I agree with what @Wataterp said, too...he's playing dumb, as well.
Every now and then I like to reread this first chapter just to see the last page.
There's something so funny and so human seeing the MC just nonchalantly cast a magic spell out of habit, and having himself take a few seconds to realize what he just did.