We’re not sure who was more surprised by what transpired during the July 8 episode of General Hospital (recapped here): viewers or Willow and Drew, who shared a kiss we never in a million years saw coming.

Granted, Michael’s wife and Nina’s occasional hookup have long been close. But not in, ya know, a desirous way. If the show is going to go down this road, whether it altogether makes sense, there is a lot of potential for explosive drama as well as a lot of precedent in soapdom.

Back in the 1980s, you’ll recall that Ryan’s Hope (which just celebrated its anniversary) struck storyline gold with a plot in which upwardly mobile Michael Pavel was sleeping with both young married Kimberly Harris and her mother — his boss, Rae Woodard. (It didn’t end well for Michael, mind you; he wound up being shot.)

A few years later, All My Children played a similar storyline in which “Tad the Cad” Martin was falling for Liza Colby even as he was humming “Here’s to You, Mrs. Robinson” on his way to shag her mom, Marian. Ironically, decades afterward, the soap trotted out the scenario in reverse, putting Liza in bed with daughter Colby’s love interest — wait for it — Tad’s son, Damon Miller!

The examples go on and on. Young & Restless’ Jack Abbott had a fling with dad John’s wife, Jill Foster. The same show’s Summer Newman seduced mom Phyllis Summers’ then-boyfriend, Billy Abbott. And mother/daughter duo Nikki and Victoria Newman both wrote steamy chapters in the life story of author Cole Howard.

Meanwhile, Bold & Beautiful made Dylan Shaw the lust interest of both Jessica Forrester and her mom, Maggie. And Days Our Lives built a memorable triangle around Doug Williams, true love Julie Olson and her equally enamored mom, Addie.

Will General Hospital be able to set off the same kind of fireworks with Willow, Drew and Nina? TBD. It’s not as if Nina is madly in love with Drew. Although Michael, who can be every bit as volatile as Sonny, is likely to hit the roof. And Nina and Willow being drawn to the same man is sure to undo all of the progress that they’ve made since discovering that they are mother and daughter.