I rocked up to see my great friend the other day and the discussion led to her saying how knotted her back and neck muscles were. Now, I am no masseuse, however I have a fair idea how to relieve muscle tension.
I made the suggestion, and of course ML agreed. I was told there was oil in the cabinet in the bathroom so I went off to retrieve it.
When I came back with the bottle in my hand, ML was undressed and was lying on her front on her bed. I didn't want to get oil on my street clothes so I stripped off too. I poured heaps of oil over her back, legs and of course a little in her butt crack.
As I worked the oil into her muscles, she was moaning deeply as she responded to my hands all over her back, legs and cheekily between her legs. I applied the oil to her butt hole and worked her inner thighs and pussy.

I had oil all over her arse so my thumb easily went up her butt hole without the slightest resistance, and then two fingers slipped right up her cunt. As I teased her, my last two fingers found her on her large clit. Her clit is the size of my little finger up to the first knuckle by the way.

"I bet you want to slide your cock up there instead of your thumb" she said. How fucking perceptive I thought to myself.
I could easily feel my fingers through the thin skin wall separating her pussy from her arse.

She insisted I do her front too, so I oiled up her big tits, and her tubby tummy, and her bald pussy with heaps of oil.
Mate, I was so fucking rock hard watching her big oily tits move around as I rubbed her that I didn't dare touch my boner for fear of coming there and then.
All the while, she was getting as horny as I have ever seen her and she was cumming as soon as I pinched her clit between my fingers. She nearly crushed them as she squeezed that hard when she did cum. I watched her tits that moving all over the place and her nipples that were were hard and so horny all fucking oily.
I was standing beside the bed and she screamed. She raised her back off the bed and squirted on my hand as big oily nipples stood proud. That moment was as hot as I have ever seen her in 10 years of playing with her.

After a small amount of time, and when ML had calmed down a bit, she rubbed her tits with her left hand, covered it with oil, and put it between my legs as I rubbed her very wet, oily loose cunt. She looked goddess like all glowing and her legs spread wide open revealing her cunt, but she had a very devilish look on her face.
ML took two fingers, very oily fingers and rammed them up my arse and said "You love these up there don't you?". She took more oil from her tits and gripped my cock with her right hand, worked her hand rapidly back and forward on my cock and said in a husky voice "On my tits lover" 
That was it. Too much for me and I shot cum right across her tits, hitting both nipples and saw my cum disappear between the mounds. My butt was clenching her two fingers still, as she worked her oily fingers further into my arse feeling for my man g-spot. 
She smacked my cock very hard and laughed and said, "You thought that was going up my butt didn't you? It is you who is being arse fucked today" and with that increased the speed of her fingers in my butt.
That felt so good. I was coming again, when she sat up and wrapped her big oily tits around my cock and jerked me off onto her neck with them. I could barely stand up as she put her hands around my butt and pulled me closer to her big tits, my knob so sensitive and still oozing cum that we together spread between us. 

We collapsed on the bed and laughed. Next time lover, you are going to get my cock up YOUR butt...