Unfortunately, he killed no other bosses in those 10 months.
He had attempted to kill the Shadows of Yharnam, however, a 3v1 isn't very fair. Diluc was completely and utterly stuck.
In the real world, he had to go to UA entrance exam in order to prove himself ready to join.
Of course, his only reason of becoming a hero is to be able to use his quirks whenever, this desire has only amplified after he got Chastiefol.
Diluc had noticed that Izuku was hardly home anymore, and whenever he finally came home to rest, he'd be sweating to death. He'd then proceed to workout in his room and sleep until school came long, then he'd repeat the entire cycle.
Obviously, Izuku was being trained by All Might.
Regardless, the time had come. Momo got a recommendation, which allowed her to skip the entrance exam entirely. Diluc wanted to get one too as to avoid going through a boring couple of hours, but all he received is a 'Fuck You!' from Mr. Yaoyorozu.
Diluc noticed that Izuku got pulled up by Ochako. He left Izuku while he was fumbling over his words, staring at the beautiful girl in front of him.
Diluc sat down in the auditorium and fell asleep waiting for everyone to trickle in.
After half an hour or so, everyone was seated and Present Mic started yapping on and on about this and that. Diluc ignored all of it, all he had to do is kill the big robots.
Finally, they deemed everyone ready to start.
"3...2...1...GO!" The speakers yelled.
Diluc hopped on Chastiefol's pillow mode and flew away.
The staff had a couple things to say about the boy flying away like Alladin.
"Who's this kid? Is the pillow his quirk?" Thirteen asked.
"It's rare to see summoning quirks. But I don't think that's the extent to his ability." Nezu theorized.
"Hmm? You're telling me you think the handsome kid has more up his sleeve? That's obvious to anyone!" Nemuri spoke.
"That's true. Although I estimate his secrets are far heavier than you think, Midnight." Nezu spoke. He noticed the dead eyes of Diluc.
"Anyway..." The conversation shifted.
Back with Diluc, it didn't take long before he found a good cluster of robots.
He simply landed on top of a building, changed Chastiefol into its 'Thousand Dagger' form and shredded them.
Afterwards, he flew back into the sky and continued his reign of mayhem.
The rest of the students were pissed that some kid with a flying quirk was stealing all their kills.
Diluc killed a few clusters until he was satisfied. He then flew up to the highest building in the exam zone and went to sleep, ignoring the screams and sounds of battles all around him.
"The kid just went to sleep?" Nemuri was puzzled. Nezu had kept a screen on him in order to satiate his curiosity.
They saw a combat capability that was extremely rare to see. From what they understood, his quirk was similar to Hawk's, although Nezu knew there was more to the ability.
"Well, it's not like he needs to continue, he'll land first or second, easily." Aizawa commented. Everyone present felt that Aizawa was slightly jealous of the kid with a floating pillow as a quirk, but no one commented.
A couple of hours passed, and the zero-pointers came out to play.
Izuku had his hero moment while Diluc floated back to the auditorium.
Of course, he soon got a notification telling him about his brother's hospitalization.
Which resulted in staff being confused as to why a teen was flying through the halls of UA while on a green pillow.
Diluc waited an hour for Izuku to wake up and be healed before picking him up like a cat would pick up its kitten and dragging him home, flying of course.
Judging by the fact that he was screaming and crying the whole way, it seems he got a small bit of PTSD by flying with All Might.
Nevertheless, they both returned home to a very worried Inko.
"Are you two alright? Are you hurt anywhere? Do you need bandages?" Inko mumbled while walking back and forth.
Izuku had some of his own blood over his shirt as a result from using too much power and spitting out blood.
Diluc let Inko and Izuku sort themselves out while he went to lounge around with his girls. Without delay, he jumped into Anri's lap and allowed Momo to crawl into his hug as well.
They watched romance films at the request of the girls. They watched some Notebook, and some other movies that the author doesn't know about because he doesn't watch romance.
There was about one month until UA started, there was about one month until Diluc became 16, and there was about one month until his relatively peaceful life would be destroyed.
(A.N. Yes, I just changed Izuku's birthday to further suit the plot. If you haven't noticed, I'm not going to stay very faithful to canon at times.)
The holidays were going to be fully enjoyed by Momo, Izuku and Diluc. Torture was behind them for a while, and they had major plans for vacations.
To begin with, Momo coaxed Izuku and Momo to go to Hawaii with her to tour. Of course, this meant Yuria, Katherine and Anri would come along as well.
Peculiarly enough, Himiko got permission to join them as well.
Obviously, adult supervision was required, so Inko and Mitsuki came along as well.
Over the months, it felt like Mitsuki had become their family rather than Katsuki's.
Her husband and her had a falling out and filed for divorce. However, the problem of custody remained.
Because of Mitsuki's violent temper, the court decided that the husband should keep most of the custody.
Of course, Katsuki made sure to visit his mother regularly, even when he wasn't allowed to. Even if Diluc couldn't respect the brat for being annoying and violent, at least he doesn't forget about his family.
Regardless, Mitsuki usually stayed with the Midoriya family as they were her closest friends.
She was a housewife before the divorce and didn't have a source of income, so she had to find shelter where she could.
"Urg..." Izuku was vomiting into a bag, Diluc shifted away from him in his seat.
The private jet had couches for them to lounge around on.
Inko and Izuku were on their own couch, Inko was supplying Izuku with all the vomit bags he needed.
Although he was given a motion sickness pill, Izuku never stopped emptying his guts.
Toga and Momo slept on Diluc's arms while his women who were awake the whole way, would give him a lap pillow while they played with his hair.
Mitsuki often looked on at them and smiled. The reason for which was unclear.
It took a long, long time to get to Hawaii, about 18 hours.
Thankfully, Izuku eventually got used to flying and stopped flying. He still had a small headache the whole way, but it was nothing compared to the migraines he'd get when he finished a long day of moving furniture on the beach, so this was nothing.
Halfway through, the girls, mainly Momo and Himiko, pressured Diluc to show his coolest weapons.
The Farron Greatsword didn't really catch any of their eyes, and he couldn't show them the use of it, so everybody was quite underwhelmed, apart from the Dark Souls girls of course.
Next up was the Fume Ultra Greatsword. The plane slightly shifted and began flying on an angle because of the weight of the sword.
Again, he couldn't demonstrate it, but he allowed the girls to try and hold the weapon. He'd always catch it when they dropped it, which once again shifted the plane, causing the pilots to slightly panic.
Gael's Greatsword may have been their least favorite. It was a degraded weapon that didn't look as if it had any redeeming qualities. And being teenagers, Momo and Himiko weren't very impressed.
Finally, the Ringed Pair Greatswords. These weapons caught the eyes of everyone present in the plane. Two large weapons with flames radiating from it, what wasn't to love?
With the combined effort of both Momo and Himiko, they were able to hold one of the flaming greatswords, however, they couldn't do anything else with them.
Disappointed, they gave the weapon back.
"Why are you so strong?" Momo complained.
"My quirk." Diluc replied simply.
"Cheater." She pouted.
Seeing a chance, Himiko lunged at Diluc and gave him an innocent kiss.
"Hehehe, after many hours, I got my chance!" Himiko cheered.
"Hey! You're only allowed to go after me first!" Momo created a lasso and pulled Himiko off him.
Unfortunately for her, the deed was done.
Momo always wanted the first kiss; it made her proud as she was his first wife. Of course, it was selfish, but she ignored that.
"Landing in Hawaii in about 15 minutes, please prepare yourself for landing." The speakers spoke.