A situation commonly found in pornography in which someone is able to get their way with two sisters.
Dude, the Olsen twins are my dream shimaidon
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shimaidon is genre in which someone is able to get their way with two sisters. Futago means literally twins, Shimadidon futago it's Shimaidon with exclusive twins
Step-sister is bland, the real thing is shimaidon Futago. Two piece of meat from the cow