Bloodbound? I don't think there were experiments tho so maybe not
is it this 152.20% ? seme has black hair tho
151.20%?
**151.20% mybad
Guiding Hazard?? But I dont recall experiments on them
https://www.mangago.me/home/mangalist/3237932/
Try searching this list..
it was this, thanks!
it was a guide verse bl i think i remember it having smth w % in the name…. uke was prob black hair and seme gold? the plot was around them having 100% compatibility or smth like that and they were doing experiments in the lab on them…