IENE-460 - Pregnancy means no-condom raw sex? My sister-in-law seduced me right under my brother's nose!

I always had a good relationship with my brother and his wife, but things got weird after she got pregnant. Her libido went through the roof, while my brother stopped having sex with her to be 'considerate.' She started venting to me, and eventually, the woman I've always admired started coming onto me. With my brother just in the next room, I couldn't help but give in.