I know, right? Lemme tell the people who get worked up over this three reasons why they shouldn't:
1.) They're supposed to be succubi. Y'know, DEMONS of LUST and sexytimes. With no moral standards. This kind of thing is TAME by their standards (and the internet's, while we're at it)
2.)Even when discounting that, they're still siblings. Tell me you haven't seen people give their siblings a kiss every now and again… And I'm not referring to rednecks, by the way.
3.)