Mijn stiefzus betrapt me op masturberen, ze vertelt me dat als ik me laat neuken, ze het niet aan mijn man zal vertellen

My stepsister is in the house where I live with my husband, suddenly she discovers me masturbating because my husband doesn't please me, she tells me what she is going to tell my husband, I ask her to please not do it, then she tells me that I won't tell her if I let her fuck me too (Spanish)