[ When she agrees, he does feel a sense of relief. Truthfully, he was worried he might have gone too far with that comment and possibly upset her with how blunt he was. Just from what he was told, he already didn't like her past family. Having a loving family is what shaped him into the person he is now and just the idea of Mio's family being like that both frustrated him and hurt his heart. ]

You might disagree with me but you're a good older sister, Mio. Even if you are related to someone, it takes a lot to say that and sacrifice your own happiness like that.

[ He does loosen his grip around her, but that's only so he could pull her into his body so he can place a soft kiss on top of her head. ]

I'm going to give you the love that you deserve. [ There's no hint of hesitation, no 'probably' or 'maybe'. The tone in his voice was full of conviction and absolute certainty. ] I'll love you so much that it will make up for Shion's family. Even if I tell you 'I love you' I mean it much more than those words. I promise to do everything in my power in order to make sure you are happy in this lifetime.