Kacchan sparkles during sex because he sweats quite a lot, so it's also normal to guess when he's nervous, embarrassed, or flustered because he sweats during those times too.
i love when izuku fucks katsuki so good or gives him the best kiss of his life and katsuki’s so dazed like “i thought you were straight?”
izuku very confidently goes “I Like Kacchan.” no denial/confirmation for katsuki’s statement—he’s simply Kacchansexual and only likes Kacchan
pup izuku staying over at the bakugo household and witnessing masaru croon at a riled up mitsuki to calm her down, then trying to mimic that sound for kacchan when he gets rowdy but because izks still just a pup, he sounds really silly and pup katsuki’s just staring at him like ?