I remember watching a subtitled Short Spanish, possibly Mexican, Youtube Video about a Couple and a shapeshifter that can transform into human. The couple is unaware of the shapeshifter. The paranormal thing shapeshifts into the Boyfriend and starts flirting with the girlfriend in bed, tickling her as well. Girlfriend laughs it off at first but tells him (it) to stop. The paranormal thing gets angry and kills the girlfriend. Then it shapeshifts into the Girlfriend tries to lure the REAL boyfriend over. If anyone knows the name or knows the link to it, I would greatly appreciate it.