I found this book on ao3. I don't know if it is on Wattpad or not. Also there was no author mentioned there , I tried finding who wrote the book but I couldn't find them.

So if anyone knows who the author of this book is please mention them here. 

Okay so the link of the book-

https://archiveofourown.org/works/8188549#main

Description

"I take it you’re not a new student?”
“What?” Harry mumbles, caught up in the way his eyes are quite literally sparkling in the light. “Oh—No. Not a student.”
“Are you a sub?” Louis asks.
Harry clenches his hands into fists, holding them behind his back as he stumbles a bit. “I don’t, uh—I mean. I’ve never really gotten a chance to be a true sub, you know? My ex-partners were always scared they’d hurt me. But, like—If I trusted someone a lot, and if we used a, a safeword. And talked about, you know, boundaries, then—Yes, yeah, I-I’m a sub.”
Louis’ eyes are so wide, his cheeks puffing out in the effort to not burst into laughter.
“Oh shit, oh my god,” Harry whispers. “You meant—Oh god."

The link is also on my message board.

Enjoy
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J xx