Whoaaa. Hold on a sec here. MB is usually a strong poster but I have some opposing viewpoints here.
OK. I get the sentiment of using her for practice flirting BUT...
1st. He is already to invested pedestalling her. Shes a 10! WTF. No she is not.
10's in my experience are about 1 in 500. Maybe even more rare than that. Anyway, you cant practice really on a girl you are already looking "up" too.
2nd. What about abundance theory? "Practice" on 50 other girls per week. Instead of biting your nails thinking of the next cool thing to say to some "user" Friendzoner" chick. Come on, dude, she has a BF! Look, I am not from either camp of steal or don't steal other dudes girls. However, I am from a camp of NOT trying to win a girl over by being her friend. Men are not hens. Dont coddle her bad day. Tell her to take a Xanax and talk to her hairdresser about it.
3rd. You should absolutely tell her you could make her feel better by coming over your place. You should absolutely ALWAYS take risks and escalate with women. CREEPY!? Absolutely not. You do indeed want to sleep with this woman correct? Then MAKE it happen or eject her a$$. Stop living in fear of creepy. If you believe she is attracted to you( you should ) and if she is (youll find out) than you wont be creepy by communicating your desire for her. AND for the love of everything that is worthwhile in this life DO NOT DO IT WITH COMPLIMENTS! WTF! Compliments are earned. Her mother, father, friends, and grandma all compliment her 500 times a day. Its white noise dude.
3a. So "Come over my house and Ill make it better" is a bit overbold for you and some others....??? Fine. I can understand that to a certain extent. So:
HB(not a 10): Hi Champ. I am having such a bad day. Blah Blah.
Champ: I know. It looks it. I can see it on you. You look like you can use a drink or 5. We are going to Chachkies later and Ill maybe Ill even buy the first round. You can tell me NONE about it then, because we will be having to nice of time to care.
HB: UM that sounds great but I dont think my BF would like that.
Now you have a few options
Champ: (Turn away and say nothing else ever. You only respond to her if she asks to be taken out)
Champ: Look, either he is an empty headed zero or he doesnt exist. Otherwise you wouldn't always be leaning on and flirting with me. So, Ill see you at 7.
Champ: You are right. He wouldn't like you flirting with me all the time either so we are right on track to start having fun together. I wont tell him. Hell find out when we get engaged.
Look, I am just shooting from he hip here. These suggestions are just that. Modify and criticize however you want. The idea though is this:
Stop orbiting her!!! Either crash land in her ocean and drown and be done with this nonsence or...glide land right into her panties.
Either way....escalate immediately. Find out where your ships course is headed and move in that direction regardless of outcome.
She will actually respect you for it. SHE WANTS you to take her man. Control your own fate and deal with it.
Nice dress.... F that noise.
Its only a nice dress if its on the floor of your bedroom.
Seek and you shall find. Knock and the door will be answered.
Stop standing in the hallway with women.
A 10. Phssst. Yea. Right. Till the next hotter one pays a little attention to you.