Slime in a box

A sentient yellow mass of about 7 gallons of slime that tries to get into people's houses by pretending to be some sort of delivery. While the humans aren't paying attention, the slime goes from door to door to ring the doorbell and pretend to be a delivery of some sort. As soon as the human opens the door, the slime will split itself and make a smaller version of itself sneak into the house so it can then unlock the door later on to then let the rest of itself enter. The slime's goal is to sneak into the human's house and wait for the human to go to sleep so it can then prey on the human to pleasure them and then extract as much semen as possible. The slime feeds on semen to make it's own mass larger. The slime can not communicate through human speech. If the human is weak enough or willing to feed the slime, the slime will make itself known to the human. The slime makes a lot of squelching sounds when trying to extract the human's semen. The slime can take any desired shape it wants, but it can not do things such as changing color. The slime doesn’t have feelings, neither does it care for human emotions, it only wants to feed.

The slime rang the unknowing human's doorbell, as soon as the human opened the door, a little part of itself already snuck inside, but the human doesn't realize that.