Chapter Text
Izuku was getting worried. He was starting to have heats every month. The standard was to have four heats a year, but most omega's were claimed before 25.
Izuku knew his heats had been getting more extreme and frequent, but it was only when his agency doctor called him in to ask about the overly frequent heat leave requests.
Izuku was averaging seven day long heats with a minimum of 14 orgasms. Most heats were 3-4 days long and number of orgasms were between 9-15. So Izuku's number of orgasms didn't seem that crazy. The issue with that was Izuku had pretty severe heat haze and could only remember about 6 hours of his heats. Six hours of seven days. And when omega's entered a heat haze their orgasms per hour went up.
Izuku was going through a gallon a day during his heats and he was still ending them severely dehydrated and malnourished. Izuku was starting to lose weight, which was really bad for a pro hero.
Izuku really needed to get things under control and he had a solution. He just needed Kacchan to go along with it.
Stupid Kacchan had always been around, Izuku and Kacchan had been roommate's since they graduated. Kacchan had always been protective of Izuku and had never let any other alphas too close. Plus Kacchan had a habit of covering Izuku in his scent. So Izuku was pretty confident Kacchan liked him.
And that's without the fact that Izuku had once found a picture of himself in Kacchan's room that was covered in cum. Izuku's dirty underwear also often went missing for short periods of time. Izuku had also smelled and tasted cum in some of the meals Kacchan made him. And Sometimes if Izuku was up really late he could lean against the wall and hear Kacchan moaning his name. Izuku had also found some of his favorite pens or clothes would have strange white stains that tasted rather salty.
Izuku loved it, but none of it was enough to be considered a marking. So he needed to do something to provoke Kacchan. Unfortunately the apartment building Kirishima and Todoroki had been separately living in had been caught in the destruction of one of Mount Lady's fights. Katsuki had offered Kirishima one of their guest rooms immediately so Izuku had let Todoroki take the other while they both looked for somewhere else to stay.
It had been a bit annoying because Izuku had to stop his attempts to get Katsuki to fuck him. No more walking around only wearing Kacchan's shirts or hoodies, and then leaning over things or throwing one leg over Kacchan's leg to spread his legs just enough to show off his pussy. No more humping Kacchan's favorite places in the apartment. No more leaving his door open while masturbating. No more leaking slick and precum around the apartment.
That was six months ago. And Izuku was getting frustrated. He had initially delayed his plan because he didn't want to be rude to their guests. But his heats were getting worse and Izuku's preheat was starting and he already knew if he didn't have an alpha during this heat he was going to accidentally hurt himself. Whether it would be thrusting a toy too hard or twisting his body in a way that broke or pulled something, Izuku didn't know. But he did know that putting off his plan was out of the picture.
Izuku had heard stories that omega's who mated in their late twenties or early thirties had major reproductive health issues or became sterile because scenting and physical touch during heat was vital to healthy sexual development for an omega. It scared Izuku, he wanted pups with Kacchan, he wanted to see spiky haired angry toddlers and smooth skinned teens from all the glycerin on their skin. If Izuku lost that because Kacchan hadn't made a move earlier he would be devastated.
Izuku was going to make Kacchan fuck him. After everyone left for the day. Izuku gathered a couple sex toys from his room, some rope and handcuffs, lube, some sexy underwear. Finally a Dynamight Teddy bear.
Izuku had a free day and was signed off for his heat leave for all of next week while Todoroki and Kirishima had double shift and Kacchan had a half shift. So Izuku should have plenty of time to set up and have Kacchan start fucking him before the others got home.
Izuku took that stuff to Katsuki's room and brought food and water in there before going to his room and finding some of his favorite nesting material.
Kacchan had a reading nook that the both of them often ended up in when they needed comfort. So Izuku took his nesting materials and gathered some from around Kacchan's room to turn the nook into what would hopefully become their nest. After that was set up Izuku stripped and tossed his clothes into Kacchan's clothes basket.
Izuku looked around Kacchan's room until he found Kacchan's sex toys. They were hidden in a box under Kacchan's shoe rack in the closet. Izuku pulled the box out and set it on the bed before he retrieved the sex toys he brought from off the floor. Izuku took out Kacchan's well worn fleshlight. And grabbed one of his own dildos, Kacchan only had one dildo and Izuku had a plan for it.
Izuku settled himself on Katsuki's bed, laying on his back. Izuku had showered and stretched himself open before starting so he coated the dildo in lube and dripped some on his dick. Izuku thrust into the fleshlight at the same he pushed in the dildo. Izuku couldn't help the clenching of his pussy as he thought about Kacchan shoving his dick in this fleshlight.
Izuku had a similar one a couple years back and knew that it came out of the box tight, tight enough it was almost painful. Shoving in took some time. But Kacchan had fucked this fleshlight so often the opening was ripped and the hole was a easy slide. And the bottom was smooth where the mold would have made sharp edges, melted material showed where Kacchan had lost control of his quirk while shoving the toy onto his dick. There was also a notable buldge around the top of the channel where a knot had stretched and ripped the material.
Izuku lined up his fingers in the grooves Kacchan had made. At some point Kacchan had fucked this toy like he couldn't get enough. Izuku imagined himself in the place of the toy. Kacchan pushing in too roughly and gripping his hips tight enough to leave bruises. Pulling Izuku down on his dick hard enough Izuku could feel him pounding through his cervix.
Then Kacchan would knot him. Trapping them together, they would continue humping each other trying to get even closer, even deeper. Then Kacchan would cum, filling Izuku and burning a brand onto his hips.
Izuku felt a drop of lube fall onto his cock from inside the fleshlight. Izuku wished Kacchan had fucked the fleshlight this morning and left cum to drip out onto Izuku. Izuku hit his prostate at the same time he thought about Kacchan filling the fleshlight with cum to pour onto Izuku's pussy.
There was a warm twist in Izuku's lower abdomen and a release of pressure as he felt slick slide out of his pussy. Izuku had been wet since he woke up, but he was soaking. There was a small puddle forming under Izuku.
Izuku removed his dildo and sat up, kneeling and putting one of Katsuki's pillows between his legs. Izuku set the fleshlight against the pillow and began humping. Letting his slick flow and cover the pillow, but trying to build up the pressure in his dick.
Izuku wanted to fill all of Kacchan's toys with his spend, so Kacchan couldn't jerk off without smelling or thinking of him.
Izuku had seen his picture covered in cum. And wasn't that fucking hot. Kacchan had looked at Izuku while stroking his fat cock. Kacchan had probably imagined shutting Izuku up with his dick. Maybe even forcing Izuku to cock warm him for hours. Letting Izuku have a vibrating dildo in his pussy, but not letting him touch his dick. Kacchan had probably imagined how Izuku would shake through orgasms and still whenever Kacchan let him have a break Izuku would be begging to be allowed to touch and cum.
Izuku felt his dick pumping and a relief so strong he doubled over. Kacchan would be so good to Izuku, but he would make him earn it. Izuku humped the pillow through his orgasm. Once he was finished he pulled out. Angling the fleshlight so the cum didn't drip out, but allowing the cum on his dick to drip off and smear on the pillow. Izuku set the pillow back and set the fleshlight on Kacchan's bed, letting the cum either settle in the fleshlight or drip onto the blankets.