Alfred walked through the Batcave in search of Bruce. Alfred didn't see or hear any trace of him until his ears caught the sound of grunts and growls. Alfred then knew that Bruce was in the gym. As he approached the door, he heard, "You'll have to do better than that to defeat me!"
"Just watch, Bats! I'll have ya on the floor bowin' down to me in a minute!" Alfred smiled and peeked in to watch. He saw Harley flip and kick Bruce in the chest as she came back up. Bruce stumbled back a bit from the impact, then, as she launched another kick, he grabbed her leg and threw her onto a pad on the ground. He rushed over and pinned her down.
"Who's bowing now?" Bruce asked with a smirk covering his face. Harley struggled a bit but couldn't get out from under his hold.
"Next time I'll get ya! You're gonna need all of ya strength tomorra'!" Bruce's smirk only grew. Harley let out a small growl and looked up at him with frustration written all over her. She appeared to be deep in thought for a moment, then her eyes lit up. Bruce looked a little worried as his smirk slowly disappeared. At that moment, Harley reached up and kissed him. Apparently, Bruce's grip on her arms faltered and she squirmed out and kicked the side of his head with the top of her foot. He looked utterly floored as he rubbed the side of his face. Harley just giggled as she cartwheeled around toward the back of him and leapt onto his back. Bruce grabbed her arms and swung her around to the front of his body. Then, he used his foot to knock her off of her feet. She lost her balance immediately and fell on her behind. As soon as he sprang toward her to pin her down again, she rolled over. He landed on his knees hard and she hopped on his back. He was caught off guard and he fell to the ground. Now, his whole front was pressed to the ground and Harley was straddling him. Then, she said, "Look who's the winner. Little ol' me. Do you admit defeat?"
"I guess, Harley. I suppose I have to give you that kiss that you wanted since you won the bet." Harley got off of him and as soon as he got up, he kissed her with a fiery passion. Alfred smiled and walked away to give them some privacy.
"Young love. I believe that if Miss Harley is all that she seems, she will make an excellent partner for Master Bruce," Alfred thought to himself.