Girlfriend’s best mate blackmails me for more sex sessions

Dear Robyn, MY bird’s mate is a right dirty cow and she has wanted to shag me for ages.

And I managed to resist her advances until just a couple of weeks ago.

My girlfriend was away at a conference for the weekend and her mate came round to my flat clutching a couple of bottles of wine and a pizza.

She said she was just checking up on me to make sure I wasn’t seeing any other women behind my bird’s back!

We soon polished off the wine and we were both a bit tipsy and I could see what was coming next.

She stood up and stripped off to her black G-string before getting out my throbbing cock and sucking me off until I spunked on her face.

She then pleasured herself with a wine bottle until I was rock-hard again.

I led her to my bedroom and gave her a good shafting.

But when I woke up the next day, I felt horribly guilty.

I told her that we couldn’t have sex again but she said she would tell my girlfriend if I didn’t carry on seeing her.

She explained that she didn’t like my girlfriend anyway and if their friendship ended she wouldn’t be that bothered.

So I now have to bang her twice a week.

The last time we did it she tied me up and spanked me with a cane.

I’m virtually her sex slave now.

What do you think I should do?