It's Yandere x yandere.
Both seme and uke are HUGE red flags, they match each-others energy.
Uke act perfect and gentle when deep now he is a psychopath who drugs his lover every night.
Seme is a stalker sociopath, who has cameras and gps in uke's phone, beat up and black mail anyone who is near uke.
Spoiler-
But the biggest plot twist is, the uke doesn't know that the seme is a stalker sociopath but seme knows all uke's secrets and pretends like he doesn't know, he purposely drinks the drugged milk given by uke, just to make him happy.
It's a messed up love story, I love it.
Big Brother, You Should Spoil Me!