The Cobra Kai set is something of a small-screen reflection of the cinematic Spider-Man franchise, where onscreen co-stars’ dynamics eventually blossom into off-screen romances. In an unexpected plot twist, Robby Keene and Sam LaRusso did end up together in real life, especially since wedding bells are ringing for their respective actors, Tanner Buchanan and Mary Mouser. Mary Mouser and Tanner Buchanan are officially ready to walk down the aisle. (Instagram) Also read | Kanye West and Bianca’s Valentine’s Day plans shut down split rumours: Here’s where they are celebrating Confirming their secret romance at the Feb 12 Netflix series finale event, the pair hard-launched their relationship on the red carpet by sealing a kiss and flaunting what looked like their diamond engagement rings. Although the initial display merely set off speculation on the love scene, Tanner and Mary eventually shared a joint Instagram post to seal the deal. Cobra Kai’s Tanner Buchanan and Mary Mouser are Instagram official “We’re so happy to finally share that we’re engaged. This is such a special moment in our …