stop the blood

The couples - Darius and Elyana, Rebelle and Zak - enter the house party of a mutual friend, Daniella. They take part in a game of Spin The Bottle...question is, how far are the limits? Things get a bit steamy.
The morning after the party, everyone wakes up to see a body with a familiar face, lying on the floor, still. A person must've witnessed something, right...or 2?