Is living with my attractive sister-in-law a bad idea?

Anonymous
So I'm African and our families are complicated as heck. I married my wife in 2020 and started her visa to bring her to the USA (fiance visa). I'm expecting her in two months! Now I have a great relationship with her big sister. Someone I can call my best friend too. Now her marriage is in shambles. Her husband is based in UK and he has been sleeping with everything he sees. He even attempted to sleep with my sister in law elder sister (not my wife).

My sister-in-law has been affected so emotionally that I saw her break down and cry right in front of my eyes. She is taking sleeping pills to sleep. Her husband disrespects and bullies her to the point she breaks. She can't find another man in west Africa because none of them can match UK's husband's wealth or power (again he is a bully). I found out that she attempted suicide and I haven't been able to get it out of my mind because I'm afraid what if she does it again. I saw how my wife and my entire in-laws were devastated at the fact that they almost lost their daughter. What's shocking is how she displayed a normal face in public and I had no clue she was at a BREAKING point. Her backbone is my wife and I'm taking her out of the country soon with the plan to sponsor her when we are able to do so.

Now, how can I live with my attractive sister-in-law and wife? People are joking about me having 2nd wife but its making more and more sense than I do. My sister-in-law is a bit more mature and shares some of my life goals. My wife is sweet and I promised to take care of her.

I don't want her to kill herself from depression. Her sister is the only person that can sponsor her through a relative visa. My house may be the only house that the family trusts overseas. I also don't want to lose my marriage.
Is living with my attractive sister-in-law a bad idea?
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