Re: Female Tentacle Monsters?
Galaxy Quest (sci-fi movie spoof). Has a human & female-tentacle monster relationship going on partway through the movie. We don't see anything explicit, but it's more than implied. xD
A game where you play as a tentacle / alien type monster where you hunt and capture males could be rather interesting. After capturing them she (you) would have to figure out what species/form to take to get each male at their maximum possible horniness in order to get the most semen out of them. Semen could be used to develop/research new forms, weapons, etc..