Forced Into Pregnancy By An Alien Parasite

Pregnancy story!

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One night, an alien parasite crept into your house and started to take advantage of you.  Upon waking, you thought the whole situation /had/ to be another wild dream, and so you let the parasite in.  Plus, it felt too good not to.
The creature’s tentacles rubbed against your dicklette, making you moan with pleasure.  Then, it went inside of you, making you feel even better and let out even louder cries.  It crept its way further inside of you, going down the tunnel of the vagina and into the uterus, until the entire creature was inside.  Once it was all over, you fell back asleep, gasping with pleasure.
The next morning, you woke up and assumed the whole thing had just been a dream, a fantasy in your head.  However, in reality, the abomination had buried itself deep into your womb—and it was taking root.
The changes over the next week were noticeable.  Your gut started to grow: it started out small, and you assumed you had just overeaten a bit, but it quickly grew bigger and bigger.  By the end of the week, your stomach was the size of a large beach ball, and the growth showed no signs of slowing down.  Realizing what had happened, and starting to panic at this strange situation, you hoped that your belly wouldn’t grow so large you would become immobilized.
Strangers started to get handsy.  People would come up to you and rub your stomach, ask you about your fatherhood, press for how long you’ve been holding this baby.  You don’t have the heart to tell them that you’re actually holding a strange alien parasite and not a kid.  But you accept their help.
And help you they do.  As your growth continues, you find it hard to even stand at times, and people are more than happy to come by your side during those situations.  Your tummy has gotten absolutely massive, bigger than you reasonably thought it could possibly get, and you wonder if some folks are starting to get suspicious.  Surely they must know that a belly this size isn’t carrying a kid, you wonder to yourself.  Surely they know.  But if they do know, they don’t show it, nor do they tell you.
And the alien itself can be pretty active.  From time to time, a tentacle wanders out of your vagina and rubs against your most sensitive parts, making you want to moan and cry out as it presses against your dicklette.  The alien does this as the worst possible times, too—it must have a pretty sadistic sense of humor.
You heft around your big belly, which groans and gurgles with every single step.  Soon you get cravings for chocolate that won’t go away, and realize the alien is hungry for human food.  Then painful contractions hit, ones that leave you reeling and needing to sit down.  It just won’t stop.
One day, when you’re getting dressed, you notice that your belly button has popped out!  At first you’re freaking out, confused as to why this happened, but a quick google search reveals that it’s normal, something that happens when your abdomen gets big like yours has.  At the same time, it’s frightening—it means your belly is burgeoning, huge, bigger than your own belly button can really handle.  And that’s an extremely strange thing.
And that’s not the only sign.  Eventually, you see a strange black line appear on your abdomen, a blackish brownish streak that leaves you confused and scared.  But after doing some research on it, you find that it has a name: the linea nigra, or pregnancy line.  Looks like it’s just another sign of your burgeoning fatherhood.
Your tummy is absolutely huge.  Soon enough, you can’t even see your feet underneath you anymore—it’s just too big for that to be possible.  Sometimes you admire your strange stomach, though: it’s shiny and bright, with a tightness to it thanks to the creature that’s inside of your womb.  It’s very firm, you notice, and extremely wide.  This alien parasite is growing to an enormous size. . .
Surely this alien has to come out sometime, you reason.
The question is, when?