I'm a dull guy living at home, but I have a cheeky little sister who's just started working. One day, she gets drunk at a company drinking party and comes home! When I make fun of her for being so sloppy, I see her breasts right in front of me! Her panties! It's really awkward... but my dick is rock hard! By the time I realized it, I'd inserted it and came inside her! But the next morning, she had no recollection of having sex with me! Does this mean that if I get her drunk, I can have sex with her and no one will find out...?