She tries to swallow it all

You smirk a little as it is obvious to you that Sister Beverly has no idea what is about to happen. You see the first jet of Master's cum pulsing up his length right as her lips are wrapped around the top of the shaft. Her body jolts a moment as the blast of spunk coats the inside of her mouth.

As the second pulse reaches her mouth she finally realizes what's happening. Her mouth makes a slurping sound as she makes sure her lips make a proper seal. Her hand continues pumping his length as he fills her mouth, trying to wring as much out of him as she can. As shot after shot splashes into her mouth, her expression gradually changes from determination to surprise. You can tell she is trying hard to contain all his cum but she knows she's going to fail soon.

With a loud gulp she swallows as much of it as she can. That seems to be enough. Her brow furrows as she tries to hold in the last few blasts of seed. These last spurts must be more than she is expecting, however, as while she is trying to hold it in, making sure she catches the last of it, her prize starts leaking from her lips. As she releases Master's cock, she can't hold it all in her mouth and most of the stored seed dribbles down her chin and onto her bust.

She looks up to Master with a very disappointed look on her face. No doubt she is expecting some sort of reprisal for her failure. You smirk, knowing he would never do such a thing, but the panic in her eyes is too amusing to not react.

Master moves a hand through the new cocksucker's hair to soothe her. "Oh don't worry, you did wonderfully. There will be plenty of time for you to try again." Relief washes over her face, though you're not sure if it's at the lack of punishment or the implication that she will get another chance to suck his dick. Master now steps away from the two of you, cracking the door open and whispering something to the guard on the other side. The guard comes in, grabs Sister Beverly by the elbow, pulls her to her feet, and guides her out to the hallway. Another guard also appears to gather up the nun's ruined robes and get them out of your way.

Once you are alone again with Master, he returns to the bed and lays down. You quickly join him, lulling him to sleep with a slow, sensual blowjob. As soon as he finishes in your mouth, you begin slinking off the bed to take your place next to him on the floor. As you are pulling away from him you feel a clawed hand lightly grasp your wrist and pull you back in. Though surprised, you don't complain as you crawl back into the bed next to your Master.