Anal.. best position?! ;)

Boyfriend and I had anal for the first time lastnight. I'm on my period so I was giving him head and he just started putting his finger in and the stimulation was crazy good. He asked if he could try it and I said yes. (We've been together a year and I guess never brought it up to conversation) it felt amazing. I haven't done anal in 2+ years, I had totally forgot how much I liked it. Had to vent haha. Any good positions for the girls who do like it?