WINCEST!
...but she'll have to settle for being a side-piece...
A wife who feeds him good food is the first prize.
A maid with gorgeous fluffy ears is the second prize.
I guess the third prize is going to be the magic bureau chief's daughter who was mentioned previously...
The only thing Onee-san has going for her that rack - which isn't that special considering the first wife has been hiding some WMDs of her own under that puffy dress and has now put them on display after slimming down her waistline.