I forgot the name of this yaoi, they switched bodies and had sex while they were in each other's bodies, after they switched back they had sex again. I guess you could consider them seke couples.
http://www.mangago.zone/read-manga/geinaru_tadaima_ire_kawarichuu/?
http://www.mangago.zone/read-manga/geinaru_tadaima_ire_kawarichuu/
THANK YOU BOTH!!
Maybe this too: http://www.mangago.zone/read-manga/tenkou_sei_ore_ga_nonke_de_aitsu_ga_gei_de/
I forgot the name of this yaoi, they switched bodies and had sex while they were in each other's bodies, after they switched back they had sex again. I guess you could consider them seke couples.