Soft, with passion

The two Celebi found a place to lay down that night. Ash was already beginning to get aroused, being that he was already close to his new lover, and found himself fully aroused as he saw the fairy's vagina for the first time.

"A-are you sure you want to follow through with this?" Ash asked as Celebi began to climb on top of him.

"I've always loved you, Ash. Knowing you returned my love has given me confidence. I don't need to say it twice. I'm ready." Celebi began to descend slowly, and moaned in pleasure as his member began to penetrate her.

"I'll keep it soft, my love." Ash said, slowly grinding. "I'd like that." Celebi said as Ash prepared to break her hymen.

"Think happy thoughts." He said as he quickly thrusted and broke her hymen, causing Celebi to whimper in pain. "I'm sorry, Celebi..."Ash said, holding his mate closer to him than before. "No, it's okay." She said with a pained look. "It's what you have to endure to become a mother." She said.

The love making went smoothly for the rest of the night. Both mythical Pokemon climaxed twice, ensuring at least one child, or at least Ash thought so. The two Celebi relaxed and touched their foreheads together, showing their new, unbreakable bond. Ash and Celebi placed a hand on each other's cheek instinctively, and found that where they had touched was a pair of white fairy wings.

"Those are our mating marks. We are now forever mated." Celebi said, giving Ash a kiss to the lips.