A forty something year old man does something to upset a shaman, who places a curse on his family as a result. A few years later what the curse is starts to become evident, when his son and daughter find themselves unable to consensually have sex with anyone. Turns out the curse means the two of them can't have sex with anyone except each other, potentially forcing them to have sexless lives. The parents however are so desperate for grandkids, that they decide they're going to make their kids a couple.