Manhwas like this

And also a manhwa or manga with swich couple

Switch couples
- https://www.mangago.zone/read-manga/happy_shitty_life/
- https://www.mangago.zone/read-manga/zero_at_the_bone/
- https://www.mangago.zone/read-manga/thirst_1/
- https://www.mangago.zone/read-manga/papa_naoto_and_papa_tomoyuki/
- https://www.mangago.zone/read-manga/50_x_50/ (no sex scenes but implied switch)
- https://www.mangago.zone/read-manga/i_got_caught_up_in_a_magical_youth/
- https://www.mangago.zone/read-manga/playtime_with_hakdo/