That sucking on it's own was a exxageration..lol but yeah once she relaxes, it's all yours to hammer as you please without pain. Unless your humongous and go so deep you hit the colon! There's another muscle ring up there and if your huge it will hit that area and cause temporary discomfort. But youd have to have a monster to go that deep! Yeah unlike the vag where you can pretty much pop it right in, the anal area has to get conditioned and relax, but once you have the area relaxed taking it slow to get there, you both will enjoy the ride. Time for DSM to chime in on his thoughts. He's been plowing the lower forty longer than me....Maybe..

As far as the blue balls you should have handled it your self to keep from getting that bad.