The crimson princess

Pov Dia,

I looked at Sera, and she looked at me.

I looked at Rimuru, and she looked at me.

Sera looked at Rimuru, and Rimuru looked at her.

I looked at Sera and Rimuru, and they looked at me.

I don't know how long we stayed like this, raging while glancing at the bed in front of us.

We agreed that we would do our first time once we were all 15. It's a little hard to know the age of Rimuru because her appearance is still the same since she got a human body, but I am sure she is more than 15 years old.

Sera celebrated her birthday a few months ago.

So in conclusion we are all 15 years old and so at any time we can make our first time.