Apologies in advance for the length of the story, I just had to describe every detail of what happened. :)
I (26M) have been with my (26F) girlfriend for 8 years, and we have been each other’s only sexual partners. Despite being each other’s only experience, we have had a great sex life, with both of us always willing to try new things for the other. My gf has thick brown hair, brown eyes, is 5’8″, with porcelain skin, a thick and curvy body with cute small perky b-cup tits. My gf is bi curious, although she has never been attracted romantically to another girl, she regularly gets off to lesbian and solo porn. I have made it clear to her that if she ever wanted to mess around with another girl, I wouldn’t consider it cheating as long as she told me. With our area lifting lockdown restrictions, little did I know this side of her would be explored.
With lockdown lifting, my gf was desperate for some social interaction other than ourselves and decided to invite her best-friend Cara from college (22F) to visit and sleepover at our place. With plenty of room for her to stay and suffering myself from cabin fever I happily obliged. Having recently broken up with her bf and being stuck living with him, Cara happily accepted the invitation for some R&R at our place 30miles away.