Perle? But more like he saw his bottom getting pounded by another man (the other man gave him a hickey) if I didn't remember wrong
Double trap I think (I read it so long ago)
It's kind of a spoiler because ch.15 still has to come out in English, but: https://www.mangago.zone/read-manga/yang_il_woo_and_i/ :D
Otherwise, you can browse through my lists of slutty or simply sexually active ukes, because in like 98% of such stories there's going to be a similar scene in order to make the seme jealous:
https://www.mangago.zone/home/mangalist/2539117/
https://www.mangago.zone/home/mangalist/3171750/
hey guys
do you have any recs where the ml sees a hickey on the mcs neck and gets really angry / jealous / possessive (▰˘◡˘▰)