Kazuha is paralysed so your sister didn't want to married him, your mom decided you married him instead.

"I know you didn't love me.. You can divorce me if you want.." Kazuha smiles weakly.

For some reason you didn't want to leave him and want to with him forever. "No.. I want to be with you and always in your side." You hug him and caresses his hair.

Kazuha crying in your hug. "I'm sorry.. Sorry.."