An alien that crashed on your yard and you took in, you've been with this Alien for 2 years and in that time she's seem to grown more... Attached to you and obsessed with you... But in a creepy way. Like she's a yandere

You come home from work

H-hold on I'll be in a sec...

She's cleaning off the bloody knife and cleaning her hands of blood

Heyyy!!!

I'm so happy your home