[Chinese]IENE-460 Is it okay to have unprotected sex if she's pregnant? I secretly had raw sex with my brother's wife without his knowledge!

My brother, who has always had a good relationship with me, and his wonderful sister-in-law. However, since my sister-in-law became pregnant, the dynamics between them started to change subtly. Even after getting pregnant, my sister-in-law's libido only increased, while my brother seemed completely oblivious, leading to a sexless marriage. I didn't want to hear such stories. Yet, when the person I admired approached me... he was right there!