Andy better shield his eyes ...

The cast of "Parks & Recreation" reunited on "Late Night with Seth Meyers" on Tuesday, following the series finale of the beloved NBC show. And, knowing we were all in need of some laughs after the show ended its run with an emotional, hour-long episode, Leslie Knope and Co. didn't disappoint.

Amy Poehler, Chris Pratt, Adam Scott, Aubrey Plaza, Nick Offerman, Retta, Aziz Ansari, Jim O'Heir and co-creator Michael Schur led the studio audience on Meyers' show in a riveting rendition of "Bye, Bye 'Lil Sebastian" -- and two costars couldn't keep their hands (or tongues!) off each other.

Plaza and O'Heir randomly started going at it as the rest of the cast sang, the two playing a serious game of tonsil hockey to the shock of everyone on stage. "I can't look at it, I can't watch. Oh MY GOD," Retta exclaimed as it went down.

Who knew Garry and April had that much passion ... and what would Gayle think?!?

While the series ended with April and Andy having a baby, Donna starting a non-profit, Ron Swanson running the national park in Pawnee, Tom Haverford becoming a self-help guru and Leslie potentially becoming President (or at least Governor), the stars revealed they had some different outcomes in mind.

"I pitched that I would have sex with Joe Manganiello and that never happened. Not a joke," Retta revealed during the group interview with Seth. 

Pratt said he wanted to see how all the characters would die, a la "Six Feet Under," and shared how he thought Andy and April would go out.

"She died of a broken heart. Andy died because he was left in a hot car with the windows rolled up," he joked.

The gang also opened up about filming their final scene together ... and revealed who was the most emotional on set. Check out the video above to find out!