what? a "dog giving a treat" is equal to someone giving a blowjob? what is that analogy? Also what was she thinking that biting the dick means she will monopolize him? what does she gain from that? the hell.
anyways so it seems like Chizuru's Mom's way to capture Chizuru's Dad back then and considering his womanzing ways is that because she was just really loyal despite knowing the Dad has alot of woman at his beck and call? I bet thats it.
im calling it now, their Deaths was because of some built up jealousy from Chizuru's Dad towards Rin's Father