The actress daughter of Bruce Willis and Demi Moore joined The CW show's cast as "a punky cute lesbian" earlier this month.
McCord, who plays Naomi Clark on the teen drama, said that she would like to be entangled in a same-sex plotline with the new addition to West Beverly High.
She told E!: "This is what I foresee. Naomi gets drunk, and she gets a little crazy. Liam's (Matt Lanter) watching. Naomi wants to experiment. And then a little lip-on-lip action with Rumer Willis can't hurt anybody, right?
"How fabulous would that be? They totally need to make it happen!"
McCord recently hinted that there may be a crossover between 90210 and The CW's update of Melrose Place.