Ashley, a female Alliance Soldier, who fought and possibly shared your bed in Mass Effect 1 becomes a possible romance option in Mass Effect 3 again. I have 2 save games for you, the first one should give you the paramour achievement and the second is the actual love scene.
The first save game puts you onto the presidential commons deck on the citadel, in front of Ashley.
This will reward you the paramour achievement.
The second scene, damn I ran over the whole citadel after each mission to finally find her, was kind of annoying but I am not really a fan of Ashley. But you are, I suppose, or you’d not be here 😀 Anyway I’ll make it short here is the save game when the action starts.