Ianto was content to let River simply sit and drink in as much as she needed to. For his part, all he did was hold her and occasionally pass a hand over her hair in what he hoped was a comforting fashion. It was sort of a reverse grief, he figured, all that bottled emotion being released.
Oddly, for being the bloke that died, it wasn't all that difficult for him. It seemed to be worse for the people around him.