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Main idea: I have a tradition in my family according to which we need to check fiancé’s fertility before marriage. Bride has to perform a traditional dance naked and then spend night with fiancé and then with fiancé’s sire (in our case - your grandpa). You fail to impregnate me even though you have been given the preference of time (you were the first to fuck me but still failed to impregnate). Your grandpa did it and now I have to marry him. We call you to our house after marriage and I greet you as my new step step-son. During your stay you have to deal with constant humiliation and jealousy. We wi be fucking in front of you and even secretly add grandpa’s cum to your meal.