A lot of the time I've found the actual sensations aren't the turn on - its the whole kinky situation I guess. Just knowing that she's doing it, and it's happening in YOUR ass, the whole taboo and everything I think.

For me, sometimes anal play is great, other times I could take it or leave it, and some times it's just not good.

Make sure you're relaxed, horny, in a positive frame of mind, and for gods' sakes EXPERIMENT!
Try different things - in and out motions, around about motions, leaving it there to vibrate, thrusting in deep etc etc etc.
Try being in different positions - on your hands and knees doggy style, lying on your back with your legs up and out, on your side, on your stomach, upside down try everything!

And keep us informed
CasperTG

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You know, Blackadder, for me socks are like sex. Tons of it about and I never seem to get any.

My Photos:
https://imgur.com/a/80hiRdm