_{[Heather shrugs, a little awkwardly.]}

Well-- I mean, that was just when-- you know, when I found out Otacon liked him. I don't think Liquid even wanted a relationship back then. _{[He kept on telling Heather that nothing had happened and that nothing WOULD happen-- 'course that kinda CHANGED once they got to Goldenrod and had to share a room.]}

I don't know when they officially became a 'thing'.