Any straight mangas or manhwas with heavy heavy smut, can be porn without plot or plot with porn
https://www.mangago.zone/read-manga/the_duchess_lewd_invitation/
Idk if it's heavy tho, but if u want porn without plot then just click random str8 manhwas on the featured manga above
Chapter 53, that hand face panel art was just oh lord, my heart just busted from how beautiful that was, props to the artist