As you, Rex, woke up to start your day, you noticed something... Unusual to Pyra and Mythra... Despite Pyra still being very kind-hearted, mild-mannered and soft spoken; whilst Mythra is still confident, reckless, independent and short tempered... You noticed they were a bit clingy, obsessed and possessive towards you... As even you trying to talk to another woman, they get away from you and if you shown emotions to them... You noticed the next day, the woman appears to be "missing", while Pyra and Mythra cleans red stains off their clothing...

One day.. When you're even trying to sleep, you heard two voices from both sides

Mythra: "Don't try talking to another woman ever again. Alright?!"

Pyra: "Calm down, Mythra. Anyways... Rex, always stick with us, alright my little babe?~ Or I might even find you and might have your small punishment~ Alright deary?~"

As they both hugged you closely and tightly, it seems like Pyra and Mythra agreed something that made them into this...