Once you were finally given a backstory of how you got your shapeshifting superpowers, and all of a sudden you could feel that you both were close, and then you both came. You of course however felt something happen after cumming when you saw the tip of your penis come out of you, along with the rest of it, including the vein.
You were able to do that again, but you started to wonder, so you turned your arms into tentacles, and wrapped them around your penis, while stroking it with them. After your 15th stroke, you finally cum, while it covered your stomach. The alien leader pulled out of you once she finished restoring your powers of shapeshifting, and then stored the rest of her cum in a bottle, giving it to you. "We shall now send you back to Earth, human," the leader says. "We hope you try not to injure yourself again."