It's kind of hard for me to root for either brother at the moment because they're both so immature. Kyousuke's teasing is excessive to the point of being insensitive, and Tomoyasu gets mad way too easily. I don't necessarily think Kyousuke is just teasing her for the fun of it. He acts like a player, but he does seem to genuinely like her. I think the problem is he seems to like teasing her more than he actually likes her romantically. If Kyousuke continues to act this way, I want her to call him out for playing with her feelings. Actually, I would also like it if Tomoyasu called him out for it eventually. That being said, maybe Kyousuke will surprise us next chapter and respond to the question sincerely and unambiguously. If I had to choose right now, I think she & Tomoyasu will (eventually) be better for each other because she's able to stand up for herself better when she's with him. He's clearly a tsundere, but I think his sweet side will come out a lot more when he's more comfortable with her and his own feelings. Thanks for translating!