Perverted GF And My Dad

A few years back i was dating a really perverted girl.
Nice tight body, blonde, small tits. mostly no underwear, no bra.
Skirts, heels, loose tops. She loved to let others see parts of her body, it turned her on.
The more booze, the more crazy she got. flashing her tits, c**t or ass.
Just telling our group she needed to suck or fuck and taking me to the toilet to do so.
I was okay with her making out with others, as long as there was no fuck or suck.
I've seen many hands of my friends exploring under her skirt or playing under her top.
She also got us some ffm threesomes which i really liked.

But probably the best were the drunken times where her and I would walk back to my apartment, which is a short walk from some bars, thru a park at night time.
She could walk over to a bench, sit on it and asked me to fuck her face, or bend over and ask to fuck her in either hole. Not many people around, mostly drunk finding their way home. She didn't mind if others were watching, that would turn her on even more.
People walking their dog, people from the bar, all sorts are out at night.

When being drunk, most men will recognize, once you started to pee, you will need to go every 5 minutes. So, there were times i stopped to fuck her, take a leak and continue.
After the first few months of our relationship she told me she was okay with pee,
and i didn't need to take it out, i could piss inside or, if i wanted on her.
So, the next night we were drunk she sat on a bench, sucked a bit, pushing on my bladder,
telling me it was okay to let go. I was resistant at first, but her pushing there and telling me,
i finally gave in and pissed on her face. Indeed, she loved it, drinking, gargling. all the dirty stuff. So, we did that too sometimes. in the park, at home, at weird places.

So, my parents, they got a new house, closed to mine, close to the same park.
And ofcourse the inevitable happened...
Her on a bench, legs spread wide, top pulled down (titties free), cum on her face
and i was pissing on her, when hearing someone saying 'holy f*ck... is that [our names]?'
It was my drunk dad... he had been drinking with friends and took a walk thru the park to get home. He walked up to us, looked at her and said holy shit, i didn't know she's such a dirty hot slut. cum face, piss face, nice tits btw honey. She looked at him, making him watch.
Shit honey, you got me hard and horny, hope your mom is up...
What you got in your pants? i hear her asking and he just took it out,
Can i, she asked me, her hands and face already getting to my dads semi hard cock.
It was so weird, so perverted and so hot, i couldn't say anything, i just let her go.
After some time he just he said he couldnt cum, he had to piss first.
her hand moved to his bladder, do it, she said, and continued to suck him
Dad just looked at me, hold on to this slut, you wont find nasty like this often.
And with that, the look on his eyes, a deep sigh, i knew he was letting go down her throat.
She continued, he sighed deeply again and held on to her head.
She showed us her mouth with his cum and swallowed his load. She got up, took my hand and said she wanted to be fucked real hard at home, which was happy to do.

(ending of story: we never talked about it with my dad, we broke up after some time)