Next doors not so little girl part 3

It was about 2 week later, my door bell went. When I opened it there was Kat looking very sheepish with a woman I didn’t know.
“Are you Harry”? She demanded angrily.
A bit hesitant I confirmed I was
She turned to Kat and said sternly, “Right you get home NOW, I’ll deal with you later”. Turning to me she said snappily “I want to talk with you so I suggest we go in”

A little taken aback agreed and showed her in to my lounge/dinner. She stood in the middle of the room looking around.
“I’m Lisa, Kat’s mum as if you couldn’t guess”
“What’s this about”? I asked nervously, unsure what Kat had been telling her.
“Corrupting My innocent daughter, you bastard”
I protested my innocence, I had no idea where this was going
“Don’t give me that ball-shit” she replied, I know what you have been up to”
“What on earth has Kat been saying” I protested weakly “I hardly know her, I’ve only met her once and that was to help out with some books my neighbour’s kid suggested I could loan her”. I explained with pretended innocence.
“What crap she almost yelled, I managed to drag the details of your sordid encounter from her last night”
“I can assure you…………”
She raised her hand, I thought she was going to hit me, then I notice she was holding a mobile phone
“Hardly know her…….! Does this look like you hardly know her……”?
I stared at the picture now displayed on the phone. It was Kat, naked on her knees with my cock in her mouth. I realised Lizzy must have taken it without me noticing. I stared at the evidence guiltily.
“You call this hardly knowing her”?, her mum demanded, then flashed another picture up. This time it was me kneeling between Kats legs sucking at that delightful pussy.
“There’s video too you horney little sod”
She pressed play and Kat’s moans of delight and my slurping on her juices could be clearly heard. I thought, shit Lizzy what have you got me in to?

“So do you enjoy ravaging innocent school girls”? She demanded (not so bloody innocent I thought)
“There’s bloody loads of them look….” She flicked through 6 or 7 more pictures with us in various positions.
Despite the difficult situation I was in I could feel a positive twitch in the trouser department as I remembered the wonderful encounter.

“So what now”? I asked hesitantly
“Now! Now, I’ll tell you what now”
She pulled out one of the dining room chairs and sat down. Now you pay”!
“What! I exclaimed you’re blackmailing me”?
“You could say that”
“Well I’m afraid regardless of what you may believe, I don’t have much money”
“Not money stupid”
“What then”
Swiftly she lifted her skirt, spread her legs a little wider then declared
“If you can make me cum in less than 10 minutes I might let you off”
“I don’t understand”
“I want some of what Kat had, now on your knees and get to it”

I was completely lost for words, unsure if she was serious or not.