Recommendation

I have one it's this

https://www.mangago.zone/read-manga/sex_drop/

https://www.mangago.zone/tag/Seme%20to%20uke/

https://www.mangago.zone/read-manga/kuroneko_kareshi_no_asobikata/

Of you like the story, there are 4sequels and this link has the order https://tvtropes.org/pmwiki/pmwiki.php/Manga/KuronekoKareshiSeries

“Like a Tidal Wave”. Technically it’s a reversible couple but the top stays mainly as a bottom. https://www.mangago.zone/read-manga/like_a_tidal_wave_from_pheromone_shower/