Having to find a costume quickly leads Anna to pick up a strange witch costume one from a quiet shop, but she soon realises this costume is not as fake as she'd assumed, and she quickly realises how to use the magic to improve her own body, as well as having some extra fun on the side.

Your girlfriend brings home a size-exchange pen and uses it to shrink you and grow herself. How small will she make you? More worryingly, how big will she get? She's getting pretty close to the ceiling already!

Jemma is your girlfriend, and you have a present for her, a potion that will let her entirely control her body. She can use this to produce a growth hormone and grow herself bigger and bigger, beyond what you could ever imagine!