http://myhentai.tv/category/alien-from-the-darkness/
Now that i've watched more hentai than the past month i think i'm done searching. not big in to hentai like i use to.
Also if you know the name this site can help find Hentai.
http://animetoplist.org/watch/demon-beast-invasion
Edit
http://en.wikipedia.org/wiki/Crimson_Climax
http://en.wikipedia.org/wiki/Campus_(anime)