@Rscreper: It doesn't always have to be direct sex with...

Rscreper
2021-08-09T18:57:42-04:00

It doesn't always have to be direct sex with the mother and daughter or sister/sister. Oyakodon and Shimaidon just means the 3rd party is having some form of sexual deed in a threesome manner. Doesn't mean they have to really fuck each other.