'Today, I'm finally going to tell Ven how I feel!' Sora has managed to block Vanitas from his thoughts, but not from hearing his words entirely.
"Ven, Ven I love you—" That's when Sora falls into the other boy's arms as Vanitas forcefully takes Sora out of his consciousness to be summoned to their now shared heart.
"Sora?! SORA!" Ven shouts then feels the evil essence seeping out of Sora's body and recognizes it as Vanitas. Vague as it may be he knows that it's his other half. So, he goes in after him.
"Sora?! SORA!" He hears Ven shouting and looking up into the pitch black only to hear Vanitas chuckling in front of him.
"You shouldn't have told him, Sora. Ven is mine and so are you, but not to his extent." Sora just growls and glares fiercely at Vanitas until he hears footsteps coming rapidly behind him. He turns around to see Ventus running up to him with a smile on his face.
"Ven—!" Sora soon shouts till he is cut off by lips, plump soft ones like his own. He closes his eyes and kisses back. His kiss! His FIRST kiss! And with VEN and he's loving it. Vanitas in the background does not tho.
He growls and readies his keyblade to dash at them. The growl had already gotten their attention as they stopped. Vanitas gets into his battle pose and so do they. Ven looks up at Sora, grabs his hand, links their fingers, squeezes it tightly, and smiles lightly at him.