Seems like you're asking for two different things. Your title asks about willingness to emote and your body asks if it's okay to close the whole group.
1. Willingness to emote - To emote is to express and emotion. You see those smiley faces...
Basically, you act out your emotions. Sometimes, you can get away with dramatizing or exaggerating the emotions.
2. Is it okay to close the whole group? Sure, but I think the argument will be that you are doing what a person in the friends zone will do.
"Hey, you guys are cool. We should all hang out together." They no longer see you as their romantic prince, rather a friend. Not that it's bad if it's your intent, but to date one afterwards would probably be unlikely. Unless you plan to game her over an extended period of time.
There, of course, is no right way or wrong way. Just the more effective, field tested way and the "lucky" way.
The field tested way is to calibrate and once you've got the whole group on your side, you can ask/tell the group that you will be pulling your target away.
The lucky way is to just get all of their numbers with equal friendliness to all members in the set...call your target later and try to set something up. Once again, it can work if you go into something like this.."Look what you made me do! I had to get all of your friends' phone numbers down so that they won't get suspicious of me getting just yours! (Playfully)"