Ok it starts with a high school boy moving into an apartment building he goes up the wrong stairs (I thank it was something like boys room's up left stairs girls room's up right stairs) & walks into the wrong room. There is a girl in a fetish outfit in front of a mirror (I thank something like that) & she does something to him. They end up living next door to each other & going to the same high school. They take turns dominating & submitting to the other. Towards the end he goes into the girls locker room & takes her panties forcing her to go to class with out them. He gives them back on the roof & he holds them while she puts them on (they are side tie if I remember right). Another girl sees it & wants the first girl to dominate her & gets turned down.

If I remember right I got linked to it when reading Sundome.
It's NOT Nozoki Ana. That's all I get from search engines.

I hope someone can help with the little bit I can remember, Thanks in Advance.

it's Takianna no Honshou wa S na no ka M na no ka Ore Dake ga Shitte Iru.