Definitions by DonBay

Spunk brothers 

When 2 good friends both ejaculate inside the same woman and the sperm joins together into 1. Similar to becoming blood brothers through pricking each others fingers.

John and Paul where so happy that Emily let them use her to become spunk brothers

Spunk brothers by DonBay March 7, 2020

Blood sisters 

The special ritual of 2 or more close girl friends that become so close that their menstrual cycles syncronise. Once this stage is complete the girls become blood sisters by sissoring each other and exchanging their monthly discharge

Amanda: Hey Helen we've become so close over the last few months that I think we should become blood sisters.
Helen: That sounds amazing I'm due on in a few days
Amanda: Me too!

Blood sisters by DonBay May 2, 2019