Threesome with another girl

Salena • Momma 🐻 Engaged 💍
So my SO and I have been talking and well story short he wants to have a threesome with another girl. I'm not sure if we're going to do it. The idea does interest me... But I wouldn't want him to touch her only me! And I don't want it to be someone I know..
My question is, has anyone tried this? If so how was it? And how was it after with your SO?
Please help!