The thing is that the only one that was considered straight up u till then was the mom. Penny was obviously bi so was his grandma, Kim so far is straight lesbian no signs of being interested in guys. How the dev will pull this off will be a thing to look into. Also just because the outcome is good doesn't mean it was a good thing. Instead of taking the easy route of I'll just fuck her and make her feel better, she could have just been there supporting and listening to her problems. Offering her comfort and a shoulder to lean on. Nope she went all for the sex. And the dev says you wont be an ass to her because the outcome was good and she will save your life later. Well she had no way of knowing that the outcome would be good she didnt even think about her friends feelings when she did all that. Also only the players know what will happen because of the spoiler you gave. The mc still feels betrayed and like the other guy said he knows nothing about his new life because he hasn't lived it, so yeah he will feel like an outcast in his own family.