Confusion was the only thing passing by any of the siblings minds, they now realized that something was very wrong, even if they didn't understand exactly everything that had changed, they knew for a fact their mother was not a slug, and whatever was happening to her could only be because of the "guests".
Thinking fast, Jeff shot a look to Lucy who immediately grabbed her younger sisters by the hands, while Jeff grabbed their mother and bolted to the front door.
Whitney – Jeff what is going on?
Jeff – I'll explain later mom.
The two slug girls never even bothered to chase them, at full sprint there was no way for them to catch them.
Jenny – What a shame, I thought you said the spell would avoid this.
Megan – We have to ask the master for some help perfecting it…
Jenny – This is going to become so much more complicated…
Megan – Yeah, but we have their mother, they will fall in line soon.
Back at the front door, Jeff and Lucy were doing everything in their power to open it but it wouldn't budge. Zoe comforted Grace as she was having a panic attack, and Whitney was just confused and even more aroused. While everyone focused on each other, she felt like sitting down on the floor. As soon as her legs didn't have to support her weight anymore they went soft, like all the bones had vanished and started to fuse with one another, all while Whitney moaned in pleasure squirting and cumming along the way.
The siblings looked in shock as their mother began looking more and more like a slug girl, and despite how horrified they were they also felt like their crotches were on fire, even Jeff who had never truly gone soft after cumming.
Jeff - *Moans* Jeff, Lucy I feel so GOOD! Come here, give mommy a hug, I want to cover you in my delicious slime.
Her tongue was also longer than a humans by at least the factor of a three, something they didn't notice in Megan and Jenny as they had not showed them.
Whitney, just as she completed her transformation, managed to grab Jeff by his arm.
Whitney – Jeff, this feel so good. Help me, I want you to inseminate me. Fuck me Jeff, please, become a slug like me!
He couldn't move, that was his mother and she was saying these crazy things t him. Zoe and Grace were also too scared to move but Lucy, fearing for her brother's safety grabbed her mother from behind and pushed her just enough so that she would let go of him. It was not an easy task as they were all slippery, but her mother was still having orgasms and could not control her body very well yet.
Whitney – Ohh! Slow down Lucy, there is enough of me for everyone.
Lucy – EVERYONE MOVE!