I guess now is almost the rule to include a route with a gay/lesbian/bi character in an otome game, but let's not mark a game as painfully heterosexual if it doesn't have one. Let's just enjoy the games for what they are.
And I agree with @AverageWeirdo on the incest topic. It was indeed something risky to add a route with such a complicated background, but the characters are not blood related, and barely now each other, so in essence they are not really family.