IB Give her a sign... spank her ass
From Create Your Own Story
Taking advantage of her kneeling, in prayer, you struck her cheeks, with the palm of your hand, trying to cop a feel, as you did. the many layers of her habit soften the blow; but she feels it, nonetheless, and you feel her too. Straightening, she covered her behind, to protect it from further assault, while looking around for what hit her. You catch a glimpse of her face, as she does, and saw her cheeks flushed from embarrassment, even though she can't find her attacker.
As she continued to search about, she looked under some of the pews, giving you an opportunity you couldn't pass up. While her head was under the pew, you flipped up her habit, exposing her thighs and her pure white panties, which covered what you were really after. As you gripped on to the side of her underwear, you heard her whimpering under the pew. She'd given up on resisting, seemly deciding it would be prudent not to disobey the ethereal.
Pulling down her last defence, you ran your hands over her delicate ass cheeks, sizing up your target. Giving her a gentle smack on the behind, you listened to the sound it made, bouncing through the church, as you watched her butt jiggle from the impact.
Methodically, you spanked one cheek and then the other, over and over, with the nun's occasional squeaks. You stopped, once you saw her behind red and raw from your punishment. After, awkwardly, pulling up her panties, you left her, confused and red cheeked, to find something else to do.
You realise it might be best to leave, now; but, at the same time, the younger nun was in the confessional / the older nun was in the confessional, just waiting for you to play with her.