That rainy night while Ash and Pikachu were out camping, Ash knew he couldn't tell Pikachu how he felt. Ever since Pikachu fought for Ash against the Spearows, they knew they would do anything for eachother.
Later that night under the heavy rain, Ash turned over looking out from under the tree to find Pikachu, gazing up at the moon with tears in its eyes, the rain still teeming heavily.
"Whats wrong Pikachu?" Ash asked, trying to keep the pokemon warm and pulling closer.
"Why are you in the rain? You're soaking wet, here."
"Chu.." replied Pikachu, blushing but snuggling up. "Pi...pika..." he turns, slowly motioning Ash to come closer. Pikachu softly reaches for Ashs cheek, rises to its tiptoes and gives ash a long and deep, loving kiss. Ash pulls Pikachu in closer, doing the same though Pikachu reluctantly pulls away, still unsure how Ash feels.
"Please.." Ash says, lifting Pikachus cute, tiny chin up with his finger, their eyes meeting.
"I.. love you Pikachu"
Blushing deeper than before and tears trickling down its face, pikachu smiles. "Ka..chu.." "Pika-pi..." They embrace eachother tight, and share another kiss in the rain.