Originally they get together by accidentally sleeping together after a party, but was also considering 'your enemy gives you your first kiss' idea, I could see Portia giving Edwin his first kiss (and many other first) and teasing him throughout it. Giving your enemy a quickie is an interesting maneuver..... Their relationship is def shaping up for some fem dom, mild degradation. I do think Portia is the one in charge normally, the first time they tried she assumed Edwin would take the lead, but quickly figured out that wasn't right. Now he just goes home and gets manhandled by his wife and he's very happy about it. She has quite the appetite....