This is what happens after already having sex with a chick,
1. one of them did ask how many girlfriends I had...always make yourself the prize, not her...even if you have had none, raise that number by a couple...after doing them, and talking to them a couple of days later, I would ask them why they asked particular questions, I know why (they wanted me of course hehe)...but they would reply with, "I could only imagine how good you could have been to them compared to me"..this shows the chick herself thought she was not good enough for me...(that's a GREAT THING right there)...
2. If a girl asks a question, and you don't quite know the answer, you should have 1 thing to reply with, in GENERAL, NO MATTER what question they ask...I would have said, well how many girlfriends do you think I have had....ask the question back to them with a..what do you think part...to make them think of your answer.
3. She fell asleep on your bed...and you did nothing! Let me say this a girl will not be sleeping on your bed unless she was comfortable with you. Did you understand that? They will not lay down on YOUR bed unless they were comfortable with you...the second part is, she actually fell asleep...merely laying there, you should have made some type of move onto her, but when she went asleep you should have made an EVEN GREATER move on her...
If she was in the covers...and was sleeping...you should have went to sleep also hehe...the same bed buddy... if she was on top of the covers...lay right next to her, while going to lay down she would have definitely looked up or been woken up...your eyes would gaze at each other and you would have had her right there and then...
4. When she asks how many girlfriends you had....it shows she wanted/had interest in you...
5. When they lay down on a bed/ACTUALLY falling asleep on your bed...she would have done it with you on the spot.
"then i offered to take the mattress out from under my bed" ...you don't offer to give a girl another bed...you offer to give a girl the bed you would be sleeping in...
"she said she would go sleep in my sisters room" ...if your sister was not there in the house you should have said something loud enough for her to hear, but soft enough and blunt enough for it to stick with her for a couple of minutes (I'll be right up in a minute)....she goes to your sisters room...you follow, you shut off the lights...find her in the bed and get right in...
Finito...I think I read a, "your father was in the house" type of thing...okay forget having sex, just make out??
That's how I would have done it...but that is just me...