You're the One

Every time Atsumu messes up we're it could ruin his future, Osamu is there to patch it up for him. Osamu is always on his brothers side, and he does his best at keeping the pace. Unfortunately, after Suna breaks up with Y/n for a foreign exchange student, Atsumu wastes no time tricking Y/n into some unforgettable sex.

How will Osamu clean up Atsumu's mess after he, not only ruined a friendship with Suna, but also ruins Y/n whole life?

Teen pregnancy
Slow burn
Atsumu is a dick
Character development 

Osamu x reader