Blood and sweat poured down Tatsumaki's face, her breathing was ragged as she glared at her opponent. The newly christened A-class, known only to her as Caped Baldy, stared at her passively.

"I-I can't believe it…" she overheard her little sister mumble. "He's actually winning."

A deep, well, as deep a growl as Tatsumaki could muster, resounded from her throat. How could she, Senritsu no Tatsumaki, S-class rank 2, be losing to some A-class?! It was unheard of! And even worse, he still looked at her with that same passive, slightly idiotic look! As if he didn't see her as a challenge, as an equal.

"Are you done yet?" he called out, bringing her out of her anger induced musings. "There's a sale that starts in an hour, and I don't wanna miss it."

"A-a sale?!" she yelled out in indignation. How could a sale be more important than their fight?! And wasn't this bald bastard supposed to be fighting for her sister?! Why is he thinking of a sale instead of her?

"Oh. Did you want to go too?" he asked, mistaking her anger for excitement. "If we go together, we could get more stuff," he mused, a small smile forming as he thought of all the delicious veggies he could get with Tatsumaki's help. Plus kids get free fruits on sunday's, so if he could get her to play along for just a little bit, they could come out with a great load. Just thinking about it got his blood boiling in excitement.

"Not interested, baldy!"

"Aw," Saitama sighed in disappointment, before being engulfed in Tatsumaki's telekinetic grasp, who was using all of her strength in a futile attempt to crush all of his bones. "...This is better than a massage, now that I think about it," Saitama said as he allowed the telekinesis to run throughout his body. "It's as if my body is floating down a gentle river, so very peaceful."

"Why?! Why won't my powers break you, dammit?!" Tatsumaki whined, ceasing her attack.

"Ah, does that mean you're done?"

"No. Never," Tatsumaki muttered, realizing she had only one technique left. A technique so dangerous she swore never to use it. "I admit, I'd rather not use this technique, but against you I have no choice."

"W-what?!" Fubuki gasped in shock. "A technique even my monster of a sister finds too brutal? What kind of move is it?"

"Prepare yourself, Caped Baldy! Not even you will be able to resist this technique." With that said, Tatsumaki cast her gaze down, her breathing slowing to a crawl.

"Eh? What kind of technique is this?" Saitama muttered, allowing his hope for a good fight get the better of him, clenching his fist in preparation for whatever attack the midget was preparing. But it was all for nought, as nothing could prepare him for what he was about to face.

Letting out one final breath, Tatsumaki slowly raised her head, and to both Fubuki and Saitama's surprise, her eyes were sparkling with tears, as if she were an injured child.

"Ah, are you alright-"

"Onii-chan," she muttered, causing Saitama's heart to skip a beat.

"W-what did you just-"

"Onii-chan!" Tatsumaki squealed louder and more desperate than ever.

"Gah!" Saitama screamed, clutching his chest from the adorable display. "W-what is this feeling in my chest? As if...it were about to burst?" he asked himself, taking deep breaths in a futile attempt to regain his bearings.

"O-onii-chan!" Tatsumaki cried, tears running down her face as she stared at Saitama in despair.

"Gahh!" Saitama screamed as he coughed up blood, before falling down to one knee. His breathing was ragged as he tried to see past his blurry vision, much to Tatsumaki's satisfaction.

"Now that that's taken care of," Tatsumaki trailed off as she looked at her sister, who was looking at her in what Tatsumaki could only assume to be awe, "Sorry you had to see that, but I had little choice. Now come on, I'm taking you-"

"It's not over yet," Saitama said, once again standing on his two feet.

"W-what?! How?!" Tatsumaki screamed in shock. "How are you standing?! Just what in the world are you?!"

"I'm just a hero for fun," Saitama answered as he made his way towards her. "And I never lose!" he cried as he rushed at her at great speeds. "Super moves: serious series!" In an instant he was infront of her, his right arm poised above Tatsumaki's head.

"SERIOUS HEAD PAT!"

"What?!" she cried, her eyes struggling to stay open as drowsiness began setting in. "Y-you're using my imouto technique against me?" she realized. It was a brilliant move, one she could have never foresaw. "S-seems like...I can no longer hold back…" Tatsumaki grieved. She never intended to go this far, but she couldn't back off now.

Mustering up the last of her strength, she wrapped her arms around Saitama's waist, looking him directly in the eyes with her own, sparkling ones.

"I-I love you, Onii-chan…"

Saitama gasped, feeling as if his heart finally exploded. The head pats slowly ceased as Saitama fell over, passing out along with a now snoring Tatsumaki, who was unable to resist the temptations of the head pats. The two were now cuddled together, snoring softly under the bright, blue sky.

"...What the hell did I just watch?" a confused Fubuki muttered, before sighing. At least her crazy sister was out of commission for awhile. "Best to leave now before she wakes up," she muttered, taking out her flip phone and taking a quick photograph, a devious smirk now adorning her face.

This was the perfect blackmail.