Your clumsy shortstack stepmother is growing too much

Your shortstack stepmother get enough being really short and being laughed by her friends group, where all mothers and really tall, so she bought a drug from shop, that will make her taller, but she doesn't knew that she accidently bought a GTS for a giant race, not for human, so she start growing from 4'5 feet tall (145 cm) in real time until she reach 11 feet (335 cm), so now you live with a giantess stepmother who still really clumsy and have only skirts. Be aware that her ass is almost hunting you by accident.

Thanks for the idea to @Kiloap from my past bot comments

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