Yeah... I don't think Seishirou really has a chance (it's really all Chitoge vs Kosaki), but this really was quite cute, and there's ever so slightly a possibility for Raku to realize she actually likes him, despite the extreme 'tsun' responses, thanks in part to this. But, again, not like he's going to pick her. He's clearly more attached to Chitoge and Kosaki than any of the other girls. But it doesn't mean he doesn't care- she's still a friend to him, even if it's a bit of an awkward friendship while she's technically under Claude's command.