When Lust didn't fight back he took it as a sign to keep going. Which only resulted in his overwhelming sense of needing even more. His tongue sought out hers. There was a whole lot more he wanted to do and he'd probably do it if Lust didn't stop him. At this point he completely ignored Greed.
TAKE THAT GREED!
And then suddenly he felt a very strong force knock him over onto the floor with a lour UMPH. "WHAT THE HELL, MAN!" Oh, riiight! Then reality set in and he didn't even have to think twice before kicking and shoving Greed off of him. "Get off you jackass!"