Threesome went into Cuckold [MMF]

So it was about a year ago and my gf and I decided that we wanted to try out a threesome with my best friend.
My gf is pretty hot so we had no doubt that my buddy would say no.
We went to a bar and began to drank.
We drank a lot so we were very drunk.
I called a cab so we could head home.
I went to the bathroom and when i finished i heard some noises From the living room.
They started to kiss and things went really fast it was amazing.
She started to suck his dick and i began to sit down to watch the whole thing.
After about 5 mins my dick was rockhard!
I tried to stand beside him but she was so focused on his cock that i just sat down and enjoyed to watch my gf.
It was the best experience in my Life.
They fucked about 30 mins but sadly with a condom.
She came like 3-4 times and She Said That it was amazing for her to get fucked while i watch her.
So my questions for u guys:
Do yall think we started to early with the whole cuckold thing?
Do yall have any tips for us for the Future?
(Sry for my english)