Take a step back and have her help you out

"I kinda need something here," you say suggestively. Your hardon is uncomfortable in your pants.

"Oh do you, now?" Callista says "Well, I suppose I'll have to do something about that," she adds with mock ****.

You sit back, and she gets down on her knees. She fondles your bulge for a bit, then unzips your pants and pulls your cock out through the fly. Taking it in one hand, she puts her mouth over your head and starts giving you a mind-melting blowjob. As she continues going down on you, she unbuttons your pants and pulls them down to your ankles, then starts to fondle and suck on your balls. Your head is lolled back as you ride out her masterful oral ministrations, and you are surprised when you feel her give your asshole a little lick. Your eyes shoot open, and she giggles playfully. "Just making sure you're paying attention," she says, then goes back to blowing you. A couple more times, she tickles your sphincter with a finger, but you aren't quite sure if it's intentional or not. You're starting to get really aroused, and need to get release or move on to something else soon.