"Why don't we take things slower, and adjust things over time?" Lily suggests, wanting to see how things turn out. "We can slowly adjust it as we need to, and can try each step separately!"
Steph contemplates it for a second... "Not a bad idea. Alright, so, we're starting out by just being able to enter her, and depending on how it goes, we can make it bigger from there." Steph put in the changes so that her pussy was stretchy, and that they could both crawl into her womb with the same pregnancy appearance they agreed on. She left out the mental change, however.
It didn't take long, and she applied the changes. Once the device finished, Steph spoke up. "They should be applied. Let's go find our new home." Excitement filled her eyes as she ran off, looking for her sister, Hannah. Lily ran behind her, trying to keep up.
The duo walked in on Hannah masturbating in the bathroom, panties around her ankles with her skirt up. "Perfect, We can get in quickly!" Hannah was too focused to even look in their direction, as Steph walked over and pushed her lips apart, crawling right in.
Lily quietly closed the door while Steph was entering their new home, and Hannah screamed in orgasm as her sister was disappearing inside. "Now's my turn."
Lily hopped over, and spread her lips to crawl in as well. Hannah was breathing heavily, letting go of her skirt before another wave of pleasure filled her, Lily's body squeezing through her.
Lily crawled quickly yet carefully, and made it into the womb with Steph. Once Lily was fully inside, Hannah had already pulled up her panties and was moving around, with her belly visibly stretched to it's limits. Neither of them knew if she noticed.
The cervix closed up behind Lily, appearing far smaller than it did before. The two were so close together, Lily could feel every curve on Steph's body. Once they were both situated, being in a sitting position with their legs wrapped around eachother, Lily let out her opinions. "Well, it's cramped and slimy in here, and getting out may be pretty hard -" She attempts to point to Hannah's cervix, which is quite a bit smaller than her pussy "- but beyond that, it's not the worst thing that could've happened. What do you wanna do?"