Things get nastay (but in the good way, like you want).

Your cock explodes inside the ooze, shooting several strands of milky white jizz into her.

"Mmmm, you like that?" The goo asks you as you start to come down.

You gasp an affirmative.

"This is where things get really fun..." the goo says.

You try to protest and tell the girl you need time to recharge, but become distracted when you feel something pushing on your anus.

The ooze is rubbing along your back entrance, and gently worming her way in. You feel a mix of shame and arousal at the pleasurable sensations and try to say something when you feel something slip past the entrance to your back door.

Your eyes spring wide open in surprise and shock as the goo penetrates your hole, and you feel the seed in your balls welling up again as she goes straight for your prostate.

You try to let out a scream (whether of pain or pleasure you can't tell), but quickly find it muffled by another sloppy kiss from the goo girl.

But instead of pulling back from you like before, the girl instead seems to expand out further around and inside of you. Her tongue seems to enlarge, slide to the back of your throat, and ooze something past your gag reflex.

You know you should be terrified by this, but instead all you feel is a dull, soothing, fuzzy warmth. Your eyelids get droopy and you find yourself groaning in appreciation at the oozes multi-faceted assault.

Down below the ooze has not forgotten about your cock. In addition to the vibrations and sucking, she's now expanding and contracting around it, expertly milking you of your sperm. When you feel as though you can take no more, the vibrations in your ass intensify.

Every nerve ending is on fire as you feel overwhelming pleasure from inside and outside your body. You try to thrash about, but the goo girl is completely restraining you. You try to voice your pleasure, but the intruder in your mouth prevents you. The muscles in your ass try to futilely squeeze, constrict or push out the invader, as your cock shoots wave after wave of your seed into the girl. You've never felt so helpless before nor encountered such alien and overwhelming pleasure.

Your eyes roll back into your head as the orgasm overwhelms you. Soon, you lose all concept of time and eventually black out.