"
Cushla was now leaning over us, trying to get a better look at the proceedings. I brought the well lubricated 'head' of the big toy up to Sienna's arse and rubbed it in little circular motions over her hole. I held the shaft with one hand and pressed the palm of my other hand against the base and pushed gently. Sienna's arsehole resisted the intrusion, refusing at first to let the giant rubber knob in. I turned to Cushla. "Put your hand on mine and help me push."
Without hesitation Cushla put her hand over mine and added her strength to mine.
Sienna's sweet rear end stood no chance now. As we watched her arsehole began to slowly expand, forced to stretch around the head of the 'cock' being pressed into her. As her ring was widened to new limits she began to whimper softly and then started to shake.
"Are you ok Si? Do you want me to stop." I asked
There was a short silence before she answered, a little choked up. "No. I can do it." she spluttered.
'Good girl,' I thought 'such a positive student.'
Cushla and I applied more pressure to the base of the 'cock' and the head disappeared into Sienna's bum, followed by a loud cry as she struggled to accept it.
"Let it out," I told her "let it out and go with it, remember to breath. It will be worth it, I promise."
Sienna didn't answer, only buried her head into the carpet muffling her cries and pulled her arse cheeks further apart. I took this to mean she wanted more and so continued to force the toy into her.
When half the dildo was inside her arse Cushla and I laid off the pressure and let Sienna try to adjust to the rubber cock. He arsehole, stretched smooth around the purple shaft looked so fucking hot and I was so proud of my new pupil, taking on such a massive task on her first day.
"That's hot." said Cushla, as though reading my thoughts and looking down at the toy jutting out of Sienna's bum.
"You've changed your tune." I said.
"I didn't realise it would be so sexy, it just looks so....hot." she couldn't think of a better adjective. And neither could I. I was always fascinated by the look of a girls arsehole being stretched to it's limits, even though I was a lover of men. I just thought it was the sexiest thing to see.
Sienna had brought her head up from the ground now and was obviously learning to accommodate the 'cock'. I took hold of the base and began thrusting it into her rear. Her head fell to the floor again and she began to groan in low almost unsettling way as I fucked her arse good and hard. I was loving being in charge, it was a completely new thrill but I needed more. I handed control of the dildo over to Cushla and stood up, picking up the rubber strap-on harness that Sienna had brought out with the other toys and slipped my legs through the leg holes, then did up the velcro tab at the back.
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