Ram it straight in.

"So, I take it you'll be nice and gentle with me as this..." Emily starts saying before you cut her off. You've rammed your entire length into her tight hole. You feel it squeezing against your dick and you can hardly fit it in. You proceed to slowly withdraw it so the tip is just resting against her asshole.

"Fuck... that... that... was intense" Emily moans

"Need a rest first?" you ask

"Well it would be.." you cut her off again by shoving my dick back into her ass. This time you keep pounding though. Every time it's only your tip in Emily's ass she sighs before moaning in pleasure when you shove the rest of your dick inside her.

After a while of pounding her tight ass you notice that her hand has drifted down her body and rubbing her clit. You can also feel her ass getting even tighter, she is clearly going to cum soon from the anal fucking. You could dp her with a dildo if you wished it... Or just make her cum.