http://www.mangago.me/read-manga/hatsukoi_no_atosaki/
http://www.mangago.me/read-manga/haru_wo_daite_ita/
http://www.mangago.me/read-manga/omoisugoshi_mo_koi_no_uchi/
http://www.mangago.me/read-manga/kozure_ookami_inoue_satou/ (the 2nd story)
http://www.mangago.me/read-manga/koi_to_wa_baka_de_aru_koto_da_dj_reversible/ (Check out this mangaka's works. I think some of her couples can be considered seke couples but I don't remember much ;;)
These ones are more semexseme:
http://www.mangago.me/read-manga/puchitto_hajiketa/
http://www.mangago.me/read-manga/parallel_lines/
http://www.mangago.me/read-manga/harenchi_no_susume/
http://www.mangago.me/read-manga/sono_kuchibiru_ni_yoru_no_tsuyu/ (this ones really dark, so I wouldn't recommend it if you can't handle "extreme"? stuff.)
http://www.mangago.me/read-manga/kondo_koso_honki/ (last two chapters)
and I just read this one earlier, it's in Japanese though, but it's mostly smut so I don't think it'll be a problem ;; https://myreadingmanga.info/enzou-dragless-sex-jp/3/ (only this chapter ;; sorry it's outside the site)
Anyway, happy reading! <3
Or Check it out
http://www.mangago.me/tag/Seke/
http://www.mangago.me/tag/Reversible/
Can you guys send me links to a bunch of seke couples? Im starting to get really interested in them