내 배다른 여동생이 자위하는 걸 포착하고, 내가 그녀를 따먹게 한다면 남편에게 말하지 않겠다고 말하는 그녀

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)