Responses
These all have couples who switch:
http://www.mangago.zone/read-manga/like_a_tidal_wave_from_pheromone_shower/
http://www.mangago.zone/read-manga/hatsujo_porno_star/
http://www.mangago.zone/read-manga/dark_heaven/
http://www.mangago.zone/read-manga/playtime_with_hakdo/
If you wanna check out more, try searching: http://www.mangago.zone/tag/switch/
Thanks for the nice view, but is there any body who can give me some yaoi recomendation like this, i mean the couple that top and bottom can be exchanged sometime?? Like top become bottom or otherwise (●'◡'●)ﾉ