Chapter Text
Genos was extremely bored.
While the Hero Association had made the meeting sound like an urgent affair over the phone, demanding that his attendance was absolutely mandatory, the cyborg was more than put out when he found that the meeting consisted of nothing more than a statistical analysis on Mysterious Being appearances. He couldn’t help but check his phone every few minutes, hoping that the two hours were suddenly up and he could return home to finish the laundry and get started on dinner.
It was a bit of a surprise when his phone vibrated in the middle of him checking the time to see a message from Sensei. Apparently, he was going to the department store for a major summer clearance sale and wanted to know if the teen needed anything while he was there.
Completely ignoring the fat, balding scientist in front of the massive display a the head of the table, Genos made no effort to hide his phone as he typed out a message to his mentor reminding the older man that he should pick up some new underwear if he could find a good price on the bulk packs. When he received an affirmation, the cyborg snapped his phone closed rather loudly and challenged anyone with his signature scowl to say anything to in regards to his inattention.
The scientist sighed rather exasperatedly and turned his attention back to the information being shown at the front of the room, continuing to drone on about seismic activity correlating with the number of Dragon level threats occurring at a given time. It was at this point that Genos decided that he couldn’t take anymore of this nonsense and stood to leave.
“Demon Cyborg, is there a more pressing matter that needs your attention at the moment? We’re only about halfway through the presentation.”
“Yes… Sensei needs my help immediately!” Genos lied easily, turning on his heel to leave before anyone could comment further.
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When Saitama got home, he was exhausted - who knew that fighting off soccer mom’s would tire him out more than any battle with a Dragon level threat would - but he was certainly proud of himself since he made a killing at the department store. He was more than a little excited to show Genos his success.
The cyborg in question had apparently been very busy for someone who was supposed to be at an S Class meeting since the smell of that signature yaki udon was filling the apartment.
“I’m home!”
“Welcome home, Sensei!”
The older hero made his way past the kitchen to drop the different shopping bags in the main room then leaned into the window of the kitchen.
“Oi, Genos, what happened to the meeting? I was sure I’d beat you home.”
“I left early, Sensei. There was nothing meaningful being shared so I felt my time would be better spent here. Having dinner prepared by the time you returned was far more productive in my personal opinion.”
“I see. Well, when you’re done with that, come over here and check out some of the stuff I got!”
“Of course, Sensei.”
After Genos set the food out on the table and they both ate their fill, Saitama pulled over several of the bags to show off all the cool summer clothes he had managed to scoop up. They were pretty basic things for the most part: shorts, tank tops, thin Hawaiian designed button ups, and sandals. He showed them all to Genos, having the teen even go so far as to guess some of the prices of some so he could proudly correct him.
“Sensei seems to have found some very good deals, but did you remember to get underwear?”
“Oh yeah, they’re in there.” Saitama gestured at the bag he left near the closet. “Got a really good deal on them too, which is really surprising. It’s not often you find packs of underwear so cheap.”
“Well, even if they were a bit more expensive, it was a necessary purchase, Sensei, since you’ve recently lost so many clothes to my negligence.” Genos looked rather dejected causing the older hero to feel a little bad for the cyborg.
“Hey man, it’s not that big of a deal. It’s more my fault for hovering while you’re fighting. If I stayed outside the blast radius of your flamethrower, I wouldn’t lose so many clothes, right?”
“That is true, Sensei, but it does not excuse the fact that I have been so careless recently.”
“C’mon, don’t be like that. Let’s just clean up and watch a movie before we get ready for bed.” Saitama gathered up some of the dishes from the table and shuffled off to the kitchen. He could hear his disciple practically scrambling to follow suit.
“Yes, Sensei!”
“Dude, you don’t need to yell, I’m right here.” He took the dishes from Genos and laid them in the sink before pushing the younger hero towards the doorway.
“I’ll wash these, you go pick out the movie.”
“Of course, Sensei.”
Saitama sighed heavily as he started on the dishes, watching the stiff teen sift through the dvds on the shelf.
That kid seriously needs to loosen up a bit.
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After the movie, Genos insisted that Sensei used the bath first while he went about putting the table off against the wall and laying the futons out.
He was fluffing Sensei’s pillow when he heard the older hero exit the bathroom and make his way to the main room.
“Hey, Genos, look at this! I think I figured out why these were so cheap!”
When Genos turned around, he nearly short-circuited at the sight of his mentor wearing nothing but a small pair of underwear - women’s underwear at that.
“Sensei… those-”
“I mean look at the back… there’s not nearly enough material to cover my butt and it looks like they forgot to actually leave a hole in the front.” Sensei was twisting and turning showing off the fake white on red brief design that seemed rather tight in the front.
The young hero was trying his hardest to muster the courage to tell Sensei that those were not designed with men in mind when the older man tugged at the waistband a bit, pulling the back up so the bottom seam of the underwear cut across the middle of his asscheeks.
“Ah… Sensei, I don’t think...” The sight proved to be too much for Genos to handle - his internal cooling systems engaging to try and lower the sudden rise in his core temperature - and he lost his train of thought; the words dying out before he could finish.
“Well, it’s whatever. They really were a good deal - I got 10 of them for only ¥ 2,700 - and it’s not like I can’t just pull the front down when I need to pee. Maybe I’ll go back and see if there are anymore left tomorrow.” And with that, Sensei made his way back to the bathroom to retrieve his night clothes - all while Genos’ core components put in overtime as he tried to process what he’d just seen.
Sensei had bought women’s panties… Sensei was wearing women’s panties and had intentions of buying more.
The biggest surprise for the young cyborg was the fact that he found the idea extremely arousing.