Personally, I'm not in this for "pairing up", but if one of the girls wants to get with Mimi, I won't necessarily say no.
I won't necessarily say yes, either...!
My biggest issues with "pairing up" in group games are:
1) It can turn the game into a series of one-on-one smutt games that are linked only by the title and setting.
2) Players join, pair up, have sex and drop out, which kills the story.
3) If the player your character is "paired" with drops out mid scene, you are left unable to post anything!
4) It discourages group interaction.
Just my 2p worth on the subject, feel free to disregard!
Whatever, my group game characters tend to be promiscuous...!