this is the only story I could think of that sounded similar to that so I'm probably wrong since it's not an omegaverse story but it is B&W with a couple and a stalker guy that wants to be with them.
https://www.mangago.me/read-manga/the_perfect_triangle/
omg!! yes it's this one thank you so muchhh(≧∀≦)
and yeah sorry I thought it was an omegaverse as I was reading one earlier (￣∇￣")
have a great day!
You're welcome! and no worries I sometimes misremember details of stories cuz of other stories I've read too dw (▰˘◡˘▰)
hello guys, I've been searching this manwha. it's a bl in black and white about omegaverse and its a threesome. there's a couple and the third guy is like their stalker that wants to be with them too.
idk if I said it right, sorry for my bad english
(=・ω・=)