It will be a crossover story. You see, Ichika has been mistreated by his IS harem for far too long. Due to their lack of love Houki and the IS girls giving him, he feel really insecure like Keitaro from Love Hina. Not to mention getting caught in the misunderstanding in one way or another. And if that's not enough, they also keeping their feelings for Ichika a secret for far too long as well as the harem hijinxs. Thus, preventing Ichika from try to bond anyone of them. He is completely alone. After bearing the abuse from the IS girls for the last time, Ichika had enough of the grief he's been going through at IS Academy by Houki and the IS girls. Thus, he makes the decision to leave the IS Academy. He'll be staying at Maison Izumo for a while. There's more to the story I about to tell you. At first, Houki, and the IS girls go out their way to hunt Ichika down and trying to take him back to the IS Academy by force. But, Minato Sahashi and his Sekirei was there to protect him from their attacks. It's kind of like Love Hina's story, "For His Own Sake"
https://www.fanfiction.net/s/7106346/1/For-His-Own-Sake. While Ichika's relocated at Maison Izumo, the IS girls slowly learn the error of their ways. Little by little, they each admit their actions cause Ichika to leave the IS Academy. Minato and the Sekireis kindly teach Ichika about dating and what love really is. At the semi-end of the story and the end of the story, Houki and the IS girls seriously apologize to Ichika for what they'd done. Then they will make it up to him. And then ask him to forgive them. Then Ichika will be more than happy to forgive them. After that, Minato and Musubi tells the IS girls not to abuse their Ichika again and treat him with respect. Next, Ichika thanks Minato and the Sekirei for their hospitality and then head for home. As for the shippings for this story.
It will be Minato Sahashi X Ichika Orimura (like brotherly love), and Minato Sahashi X his Sekirei harem. And probably Ichika Orimura X IS Harem (once he forgives them)
You see, the relationship between Minato and Ichika is that they are good friends. Meaning that Ichika mostly spend his time with Minato like if they are brothers. But doesn't mean Minato stop spending time with Sekirei and the other Sekirei girls In fact, I like to tell you this on this story. After Ichika witness the bond between Minato and his Sekirei harem, he feel kind of jealous of Minato ( in the good way) like he wishes the girls around him treat him kindly. Not badly like some other guys.
I was so inspired by that story "For his Own Sake" . It shows that bullying and abusing is no way to form a romantic relationship. It comes to show that love conquers all. Meaning love triumph over hate. But there's one important thing you must know. The difference between Love Hina fanfic and this story is at the end of this story, Ichika forgive his IS harem and Chifuyu. And then head back home. In addition, Houki and the IS girls learned their lesson. The thing is, it will be kind of similar to Love Hina's Fanfic, "For His Own Shake". But in the end, Houki and the other IS girls learn their lessons and they are forgiven by Ichika and head back to IS Academy. However, Miya inform the IS girls and Chifuyu to treat Ichika with fairness and respect. She also warn him that if they were to abuse Ichika again, well then, Miya won't show any mercy as she'll be taking Ichika away from the IS harem and Chifuyu.