Would having a threesome with a bi gf ruin the relationship

[Lux]

Title. I feel like it could drive the girl insane post-threesome, even if she's into it in the moment, but that might be me projecting male brain.

 

[Mako]

Tbh she might try to break up with you and dump for the bi girl

 

[Gonthar]

Ever heard of a "ménage à trois"?
You see, before threesomes became a casual thing, this stuff usually happened in domestic arrangements between three people - they all lived together in relationship and did all the stuff a normal couple would do but in three.
So, you could just bring the other girl to live with you and be happy all the three of you together.

 

[Yliaster]

if your stroke game is weak then yeah it can def go south