及川うみ & 北こうじ Costar Works

及川うみ and 北こうじ are an established costar duo, teaming up across 2 works from their initial collaboration '「夫には絶対に言えません」義父に抱かれたなんて…5章' (2024) to '書道コンクールに応募する書道家は己の体で勝負する 及川うみ' (2025). Their collaborations are predominantly released under the マザー label, demonstrating exceptional on-screen chemistry in genres such as 中出し・3P・4P.