The Life with Derek movie, Vacation with Derek has one of the best cinematic endings. Especially if you're a Dasey shipper.
Derek is seeing this land developer's daughter, Roxy who is more or less the female version of himself. She's rich, self obsessed and lazy. He realizes he doesn't want to be with her anymore when (Casey) his family needs his help to save Casey's grandmother's lake front lodge.
Casey on the other hand starts dating Jesse, a waiter by day, dancer by night. He loves to dance but is afraid of what would happen if he really put himself out there. Sound familiar? Yeah, like Roxy is Derek, Jesse is Casey. heh heh Anyway, the two of them agree to dance together to help Lizzie, Edwin and Marti put on a talent show to help Felicia keep her land.
Naturally everything works out in the end and they have a dance party at the lodge to celebrate. Casey is mid-kiss with Jesse when Derek comes up and physically drags her away so he can dance with her himself.
Oh, and here's a Dasey video with this love triangle. It's the Glee cast singing Rick Springfield's Jessie's girl. LOL
Click to view
And finally this Derek & Casey dating history poster I found via tumblr was too hilarious not to post. If anything it's just more proof they need to be together! LOL