From what i could gather, this is from a japanese "game" (it’s not really a game, just an exe with several videos and a comic), this is the merging of the videos in it. The all story, because i looked at the comic, has the succubus appearing while the guy is sleeping, and ends with the guy just a corpse (she is succubus, so she feeds on sexual energy). The video is what happens during those two moments (the comic is more complete, but…it is what it is). It starts with the succubus naked on the bed, trying to seduce the guy. Soon enough the succubus starts to give him a blowjob, then she jumps on him for a cowgirl ride.
Video: 960×720, AVC (H.264), 1442kbps