A well trained sub he waits for Alexis and Sara to return

Mark by now of course was feeling the urge to get closer to his girlfriends hot sister as soon as possible, yet he had been trained so well by Sara that he knew that a "good boy" he had to wait for Alexis to come over herself.

Especially as he expected that Sara was keen to have him perform for his temporary keyholder under her supervision.

Finally both arrived nearly simultaniously, maybe it was accidentally or planned, Mark would never find out.

The sisters looked each others in the eye, than Alexis turned to Mark:

"Well Sara offered me to finalize your training, what do you think about it?"

Her sneer looked still cute yet was at the same time disturbing.

Before Mark could say anything Sara chirped in:

"Well sis he seems a bit shy about expressing his urges today, which is good, yet now it is just slowing everything down. So let me assure you that he is ready and...."

She groped Marks butt.

"....more than ready for you to join me as his superior!"

"I like a subservient boy toys you know that sis..." Alexis replied checking Mark out as if he was a kind of breeding cattle.

"On the other hand how would you like a real bull for a change?"

Alexis nodeded back towards the group of her admirers

"I think we can find us some real bad boys over there..."

Mark listened in disbelieve...