Through the convenient gap
As he was thinking, he remembered what happened earlier involving his sister. Her skirt was so short that, when she leaned down, she ended up flashing her panties to Jeff, showing a convenient hole where her genitals were. "I might be able to do something there..."
He knew he was going to attempt to be sneaky anyways, and decided to take his clothes off now, so he can feel everything when he gets in. "I guess this is a bit more reason to stay out of sight, anyways."
Placing his clothes in a pile on the bed, he slips the door open, peeking out. "Nobody there..." Seeing the hallway empty, he went out on the hunt.
A few minutes later, after a close encounter with his brother, he found where Emily was. She was leaning down, trying to pick up a mess on the floor, completely unaware of how exposed her lower bits are. Jeff used his chance, and got as close as he could, getting a clear view of her vaginal lips.
Making sure she was facing away, he inched closer. Spreading the lips, he could feel her freeze up, the unknown sensation causing her to breathe more heavily. Then, he aligns his head, and pushes right on in.
He pushes farther, with Emily falling onto the floor. Her breathing was fast but heavy, and she ended up screaming, Jeff feeling the fluids rushing around him and falling onto the floor...
But what happens next?
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- Jeff succeeds in getting in, with the only trace being Emily's orgasm.
- Jeff crawls through into the womb, with Emily's belly appearing slightly pregnant (One month)
- Jeff crawls through into the womb, with Emily's belly appearing slightly pregnant (Two months)
- Jeff crawls through into the womb, with Emily's belly appearing slightly pregnant (Three months)
- Jeff crawls through into the womb, with Emily's belly appearing partially pregnant (Four months)
- Jeff crawls through into the womb, with Emily's belly appearing partially pregnant (Five months)
- Jeff crawls through into the womb, with Emily's belly appearing partially pregnant (Six months)
- Jeff enters the womb, with Emily's belly stretched pretty far (Seven months)
- Jeff enters the womb, with Emily's belly stretched pretty far (Eight months)
- Jeff enters the womb, with Emily's belly stretched to a state of near labor (Nine months)
- Jeff enters the womb, stretching Emily's womb with the entirety of his mass and making it massive
- After her orgasm, Jeff ends up stuck, his lower half sticking out
- After her orgasm, Jeff ends up stuck, with the bottom of his legs sticking out
- Emily's scream caused their brother to come in, catching Jeff (Toddler)
- Emily's scream caused their brother to come in, catching Jeff (Child)
- Emily's scream caused their brother to come in, catching Jeff (Pre-teen)
- Emily's scream caused their brother to come in, catching Jeff (Teen; Younger)
- Emily's scream caused their brother to come in, catching Jeff (Teen; Mid)
- Emily's scream caused their brother to come in, catching Jeff (Teen; Older)
- The orgasm caused it to get too slippery, with Jeff sliding back out
- Emily's front half falls to the ground, with Jeff sliding right in