Responses
https://www.mangago.zone/read-manga/like_a_tidal_wave_from_pheromone_shower/
https://www.mangago.zone/read-manga/saye/ (adapted from a novel where they switch but the manhua should be censored)
https://www.mangago.zone/read-manga/a_shoulder_to_cry_on/ is confirmed switch couple, but it's shounen-ai again
https://www.mangago.zone/tag/Seke/
Nice list! I also suggest Dark Heaven
Stories with Seke couples