What exactly makes you think that? Sasha literally admitted to it during their dinner pretty casually, which makes it seem like it's a rather common occurrence. Unless I'm misremembering something from the h-mangas where he encourages it and enjoys it. From Sasha's point of view, it looks like a way of fishing for attention from Papa, trying to get him to care about her - show his fatherly side which she lacked the presence of. As for how Papa is acting, I feel like he's acting exactly how you'd expect - angry. There's one thing seeing your daughter get railed by another person and another meeting them (even if he secretly likes receiving the videos).
It's similar to how Futoshi thinks he likes getting Netorase'd by Sasha since it fuels his mangaka drawing spirit, but when it actually happens he's bawling his eyes out.