Well to be honest it's too soon to tell if it's going that route...but it does concern me as well. Also, I'd like to point out I really did enjoy this title, as well how the story introduced the ward girls into the house.
And it's obvious MC's best friend is totally into him (and most of her female family members as well), but I'm just not so sure if she was swing that way while MC was in the forest for five years. Though, hearing her say she would be into licking the muscle chick's stomach was odd for me, and then MC relays it back to that shy girl to give her some confidence (which that could have been a user choice to enable or disable any future content with potential lesbian kink... And for me I would have kept that comment to myself during my play though

).
So I would suggest to not cancel this title out because of the mentioned bi / lesbian content, as the story so far is really good and there still hasn't been definite signs that overboard sharing bi content will be present to the degree of predatory lesbian love interests.
Regards.