"... celebrating my birthday last night at your house, and even invited our friends to come over, remember?"
"Oh yeah, I remember, me and my friends were having your birthday with our fri- Wait, hold on a sec, woman. Your birthday? No no no no, I remember that I was celebrating my girlfriend's birthday, not you." you stop as you now remember what happened last night. You were having a birthday party of your girlfriend with your group of friends to come over at your house, it was a great party that you and your friends drink a lot of alcohol, but you don't actually remember about having this girl on your girlfriend's birthday, and even her birthday this is so strange. "Look, lady. I don't know who you are and whatever you and I have sex with each other, but you're not pretending to be my girlfriend." you say to the girl next to you.
"Well, you will know when I'm finished my story." the strange busty girl replies.
"Okay, make it quick." you say.
"While we have a party, our friends bring out the cake and some presents, and some of them you made it for me and that I really like it." your girlfriend, no... the strange girl tells.
"And what happens next?" you ask as you're curious about it and try to remember.
"And then,...