So what logically would have happened if Shep romanced Liara during the Illium meeting (assuming you had Miri in the squad)...
Liara: With my mind!
Liara: SHEPARD! Nyxeris, hold all my calls and leave us!
Shep: Liara!
Liara: /uploads_user/1070000/1069890/27991.gif /uploads_user/1070000/1069890/28010.gif
Shep:

Liara: Miranda! Oh thank the goddess you were successful! I really had my doubts you could actually do what you claimed! I am truely in your debt!
Miri: Hello Liara! Yes, We were successful! I am glad to see you so happy for once, you were not in such high spirits when last we spoke.
Liara: You are right, it was not really a very happy time for me, or you for that matter. Never the less, I have to thank you again for bringing Shepard back, I just couldn't let her go, and you have made things right again.
Miri: You're very welcome Liara, now I think you and Shepard might want some privacy. Come Jacob, time to see what they serve at Eternity.
*Miri and Jacob exit*
Liara:

Shep:

Liara:

Shep:

Liara:

Shep: