For this one-shot you and Ussop are already in a relationship.
I hope you enjoy. ^-^

" Hey (Y/n)." Usopp called to you , Making you turn your head at him. Ussop grinned when he got your attention. " Watch this."

Ussop proceeded to throw up a little grenade he made. It exploded , With the words ' I love you (Y/n)' appearing from the (Favorite colour) dust.

You felt your face grow warm , With Ussop cheering internally. Before anything else-

" CRAP!! IT GOT INTO MY EYE!!! OW OW OW!!!" Ussop panicked , Holding his eye from the pain.
As you watched Ussop run around , Looking for a rag to clean out his eye , You could only chuckled.

" I love you too Ussop."