Some of the first things that Nemuri learned rather quickly about her charge, Izuchi Midoriya, was the fact that the reptilian girl could be very clingy when it came to things and people she became attached to, not that Nemuri really minded. Something that made Nemuri uncomfortable however was the fact that Izuchi seemed to prefer sleeping the way where her mutation was as little an inconvenience as possible. In other words, wearing nothing. What made Nemuri uncomfortable was the fact that she too preferred sleeping in nothing (but could also sleep in her underwear and/or an oversized t-shirt at the very minimum), which made it awkward for the dark purple haired woman who had offered to share her bed with her charge for the night, at least until Izuchi got her own bed. While the reptilian girl was out like a light almost immediately, hugging her new guardian, it took quite some time for said guardian to fall asleep herself (though the R-rated hero's understandable worry about being accidentally stung or even scratched by the poisonous quills on Izuchi's clubbed tail might also had something to do with it). The subtle warmth that seemed to be originating from within Izuchi's chest and gently spreading throughout the reptilian girl's body that was clinging onto Nemuri, who was somewhat reminded about a nice gentle warmth from her own childhood, was what made the dark purple haired woman fall asleep while subconsciously giving the girl clinging to her a gentle hug with a content smile on her face and make an accurate (if somewhat absentminded) guess on how her charge had kept herself from freezing during particularly cold times in Endoru Forest.
A lot of monsters from the Monster Hunter-games, and people in possession of Quirks giving them the traits of those monsters, possessed a special organ known as a Flame Sac that allowed them to generate and usually breathe fire. While the exact location of the Flame Sacs varied between the species of monsters and Quirked people, x-rays had shown that the Flame Sac was located in the chest when it came to people who had Quirks similar to Izuchi, which were occasionally named after the various species of monsters from the games that were related to the Rathian (such as the Queen of the Land's male counterpart, the King of the Sky, Rathalos). Something that studies had shown was the interesting discovery that a lot of holders of Quirks granting them traits of monsters from Monster Hunter was in possession of a special sac responsible for granting them their elemental or status ailment-inducing abilities, such as paralysis, sleep or poison, sometimes possessing multiple types of elemental and/or status ailment-inducing sacs of different types at the same time.
When Nemuri got up the following morning, carefully wiggling her way out of her charge's grasp, the first thing she did was making an important series of phone calls, one of which was about getting a reinforced bed delivered to her apartment (something that made her very thankful and proud of herself for acquiring and investing in a particularly large apartment with more than one private room (three in total, one being the one she used as her own, the second being used as an occasionally used guest-room and finally the third being empty)). The reason why she ordered a reinforced bed was because of the fact that people with Mutant-Quirks generally speaking had greater physical strength than those who's Quirks didn't give them some level of enhanced strength, mostly because their mutated bodies were structured differently and normal beds weren't built for the level of strength inherent in certain Mutant-Quirks (typically Animal-subclassed ones, but there were exceptions). Another phone call Nemuri made was with someone from her childhood, who she had originally drifted apart from due to them being uncomfortable around the dark purple haired woman due to her preferences, only for the two to end up on better terms than before after the two wind up sleeping together after a few drinks too many, ending up as friends with benefits. An Underground Hero (or rather Heroine) by the Hero-name of The Sharpshooting Hero: Cartridge, real name Yumi Balalaika, who Nemuri occasionally got together with for the occasional hook up and round of BDSM (and would actually like to ask out on a proper date one day).
"So, you've wind up taking in a kid due to the kid in question getting attached to you and being recommended as a suitable guardian by the on-site crew of a rescue mission. Did I miss something Neru-chan?" Asked the woman on the other end of the phone call. Despite speaking in perfect Japanese, there was a Russian accent in the woman's voice.
"Nope. You summarized the situation perfectly Yumi-chan." Replied Nerumi. "The kid's name is Izuchi Midoriya. Nice kid actually and a shy one at that. At least, that's how she is when her mind isn't overwhelmed by the instincts brought forth by her Quirk."
"Animal-subclassed Mutant-Quirk?"
"Yup. It's registered under the name of Rathian."
"Rathian? That sounds familiar, any idea why?"
"It's the name of a monster from the video game series known as Monster Hunter. Your Quirk shares the name and some characteristics with a type of weapon one can wield in the games. The Bowguns. A particular tree of the Heavy Bowgun to be specific, if memory serves." While Nemuri did roll her eyes at her friend with benefits' minor forgetfulness, she kept herself from deadpanning as Monster Hunter was something she and Yumi usually played together (when they weren't with each other).
"Ah. So that's why the name Rathian sounded familiar. Anyway, how will your new… roommate affect our… meetups?"
"I don't really know but I don't think it'll change our dynamic much."
"Okay? So when would the best time for me to come over, meet the kid and maybe play a game with you?"
"I'd say a month, maybe two, would be enough time for things to settle in. But there's something I'd like us to do differently when you come over."
"Oh? What would that be?"
"A proper date."
"Seriously?"
"Yes. While being friends with benefits is certainly enjoyable, I would like something more personal than that."
"Neru-chan…"
"Would you be willing to at least test the waters?"
"Yes."
"If not then- wait what?"
"I said yes. I'm willing to go on a date with you. To see if we can be more than friends with benefits."
"Yumi-chan…"
"Yeah?"
"Thank you for giving this a chance."
"You're welcome Neru-chan." Replied Yumi, who seemed to be smiling based on her tone, before hanging up.
"A proper date. Yes!" Nerumi couldn't help but squeal like an excited young adult, like during her time as a student of U.A-university. As the R-rated Hero was busy fantasizing (relatively innocently for her and compared to what she and Yumi had already done) about her upcoming date with her long time friend with benefits, she noticed the sounds of something, or rather someone, thrashing from her room. Violently. That and she could pick up the smell of slightly burnt sheets.
Looking towards her bed in her bedroom, Nerumi spotted the source of the sounds and the smell. Her charge, Izuchi Midoriya, was thrashing about in Nerumi's bed. With only a fraction of a second of hesitation, Nerumi rushed up to her charge and captured the reptilian girl in a strong hug, which led to Izuchi accidentally leaving a total of six scratches on Nerumi, three on her upper back and three across her butt (even if it wasn't particularly easy to distinguish what marks came from Izuchi's claws and what marks came from Nerumi and Yumi's particularly exciting meetups), before the reptilian girl calmed down.
"Hush sweetie. I'm here. I'm not going anywhere. I'm here." All but chanted Nerumi as calmingly as she could through the pain caused by her charge's claws, which made her thankful that she was into BDSM, particularly sadomasochism in this case as Izuchi's claws were really starting to dig into the flesh of Nerumi's back, thankfully nowhere deep enough for anything important to be in danger, while running a hand through her charge's hair. As the two simply remained in each other's embrace, Izuchi started crying at some point.
"*sniff**sob* I thought last night was just a dream." Said Izuchi, who was heard clearly by Nerumi despite talking into the dark purple haired woman's shoulder.
"Last night was no dream sweetie, it was real and so am I. Now, while I have quite a tolerance for pain and happen to even enjoy it on certain occasions… Can you please take your claws out of my back? It kind of hurts… and not in a good way." Asked Nerumi as her charge let out a gasp of shock, seemed to briefly poke around with her claws before carefully removing them from Nerumi's back and starting to spew out a rapid fire barrage of 'sorry's and other things in similar veins. "It's fine. I'll manage. This isn't the worst pain I've been through. I'm fine."
"*sniff**sob* But I hurt you…"
"Did you mean to?"
"*sob* No."
"See? It's fine. You didn't mean to hurt me. You were simply clinging onto me a bit too much. I'm about to go and make breakfast… care to join me?"
"*sniff* gladly."