Ma demi-sœur m’surprend en train de me masturber, elle me dit que si je la laisse me baiser, elle ne le dira pas à mon mari

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)