I hope this is what you're looking for Mark, and for everyone else a real quickie of drunken mother son sex.
***
My phone played the theme to Ghostbusters, I pulled my boxers up, picked the phone up and swiped the green. Without any form of greeting I started.
"You'll never believe this mate."
"What?"
"I needed a towel and you know we keep them in the airing cupboard in mums room."
"Yeah, so?"
"Well I didn't know mum was home yet, it's only ten, but I walked in and she was stark naked face down on the bed."
"Yeah?"
"Yeah, well she 'ad one leg on the floor and the... You alright mate?"
"Yeah why?"
"You sound funny."
"No Mate."
"...on the floor and the other was right over the other side. You sure you're OK?"
"Yeah why?
"It sound like you're panting or summ'it."
"Nah."
"And her arms were like spreadout too."
"What like starshaped."
"Yeah. Well like I said you know what her arse is like, You sure you're OK?
"Yeah, yeah fine mate."
"Well I was fucking 'ard mate."
"Yeah I woulda bin too."
"Well I was 'ard and started wanking."
"Yeah I woulda done too."
"You're doing it now."
"Nah."