Threesome with a best friend and he was a lot bigger than me

So in college one of my best friends and I ended up having a threesome with this very cute girl we both know. He’s my best friend but I can honestly say I had never seen his dick hard before this.

We started hooking up with her and she had dropped both our shorts. Naturally I glazed over and seen his dick was already hard and way bigger than I had imagined. I got hard quickly after but I couldn’t help but notice the fairly big gap in size between us.

It was a super fun experience but haven’t been able to stop thinking about the whole situation. What did she think seeing the size difference and got me wondering if I’m on smaller end for my friends.