[MMF] True, hot story about me (bisexual) and my gf

I (m25) and my gf (f25) have been together for 6 years. I love her and I think she loves me too :P.
I am bisexual and she is straight, and she didn’t know my attraction towards men until yesterday (I think).

I often watch porn when she is not home. I just need to see some bisexual or homoerotic content every now and then. I love when muscled black men with huge d*ck f*ck white boys. I often search for this kind of pics or videos. I also love cuckold and beta male stuff. But I never told this to my gf because I was afraid that she is too narrow minded for these kind of stuff.

So yesterday me and my gf went to drink and party together. I felt that she was unusually “steamy”. She took an extremely sexy dress which I really liked. As we were drinking in a bar she started to ask questions about my secret thoughts. I was quite surprised, but I tried to deny everything. But she continued to ask questions like:
-“Have you ever thought about us doing threesome with another guy?”
“Would you find it sexy if I was flirting with a sexy guy?”
I said no and tried to get rid of the topic. But suddenly she started to rub my package under the table. She felt that I was having a massive erection.
-“You are such a liar!” She said while laughed.
-“I’m not, I’m just having an erection because of the topic, not because of the exact questions.”
We continued to drink, but I could see a cocky smile at my gf’s face.