A couple of weeks on and I still hadn't been allowed to watch Derek, our fat forty something landlord, fucking my eighteen year old girlfriend Sally. I was told to sit outside our bedroom door and listen as he fucked her every day and every night on our squeaky old bed.
She'd lost interest in me sexually as well. We still cuddled and talked although I was a little awkward at first but I soon got used to the situation - mostly because I enjoyed it so much.
Gone were the initial bad feelings I might have had, to be replaced with constant erections and an overwhelming horniness. I was looking forward to their sex sessions almost as much as Sally was, and she knew it.
They did kiss in front of me though and Derek made sure I saw his hand up my girlfriends skirt as much and as often as possible. When this happened I was always spellbound, my cock threatening to burst out of my pants.
One afternoon we were all sat in the lounge, me on the armchair, Sally and Derek on the sofa kissing passionately. I was watching his hand as it crept down her back slowly, lifted up her skirt and pulled her knickers to one side. Then he stopped kissing her and looked at me, my girlfriend nuzzling his neck and moaning.
Reaching round with his other hand he pulled her buttocks apart, dipped his middle finger in my girlfriend's very obviously wet cunt and then pressed it firmly against her arsehole. Sally gasped and writhed, pushing her arse back onto his hand and forcing his finger up inside her.
She was like a bitch on heat licking and sucking at our landlords neck and face, gasping and moaning and pressing her arse back onto his hand while he slowly but forcefully fingered her anus.
All the while Derek looked at me, "I'm going to have some of this today and you're going to watch, understand?"
I just nodded, watching his finger roughly loosening my girlfriend's backside.
Derek turned his attention back to Sally and whispered something in her ear she gasped again then nodded still writhing on his thick finger.
"Tell him," Derek ordered Sally.
Amidst moans and groans Sally said, "Derek's going to invite his mate over and they're going to fuck me up the arse while you watch."
Derek laughed and pulled his finger out of Sally's arse telling her, "I'll be back in a minute babe, just need to knock my mate up. Don't you fucking move sexy!"
My girlfriend giggled and they kissed one more time before he left, then she lit up a cigarette and smiled slyly at me.
"Make sure you've got plenty of tissues, you don't want to spunk on Derek's carpet or he might not let you watch again."