A rude police man.

Both Rob and Aileen freeze in shock.
The police man is still a few feet away and seems to walk towards them slowly, but with intent. He's definitely talking to them.

Aileen jumps up, feeling Rob's dick bouncing free from herself. Both Rob and Aileen scramble to get themselves somewhat covered up.
Rob grabs his pants and holds them over his exposed midsection. Aileen pulls down her loose shirt just far enough that it almost acts like a makeshift dress.

The police man points towards the center of the park, covered by the bushes that separate this secluded path from the rest of the park.
"I am sorry to interrupt you two lovebirds, but this is the sex free zone of the park. I must ask you to relocate to the picnic lawn or the fountain, otherwise I'm **** to escort you out of the park." His voice sounds very matter-of-fact and it seems like he's done this countless times before.

Rob is frantically putting on his pants. His erection is vanishing quickly, but he's still embarrased by how his dick bounces all over the place as he tries to dress himself.
Being the only one in this situation who actually knows what the wording of the newly added rule is, Aileen is the one to answer: "What do you mean sex-free zone? Fucking here should be fine, right? Aren't we in public? Plus, this bench is so nice and secluded from everything!"

The police man laughs and readjusts his hat. "Ma'am if you don't want to be seen fuckin' I suggest doing so at home. This secluded path loops around the park and is made for walking in the shade, not sex. Please relocate to one of the public zones."
It seems to click in Aileen's mind how the rule had applied to society. She nods, disappointed. Then, as she quickly looks over her shoulder at the scrambling Rob, a mischievous grin appears on her face. She turns to the police man and says: "Can I at least suck him off? We'll be out of your hair afterwards."

The police man seems taken aback. "Suck him off? Of course no- ..." He blinks a few times, as if recognizing Aileen for the first time. "Oh! I'm sorry, of course you may suck him off. My apologies. I must ask you to refrain from comitting irresponsible intercourse though."

Aileen can't help but giggle. "Of course, Sir. It'll just be a blowjob. Have a good day." The police man nods and hesitantly turns around to walk away.
When she turns back to Rob, he stares at her dumbfounded, having just dressed himself again.
Aileen smiles and pushes him back onto the bench. "Seems like your dick sucking rule gets to shine after all."
As Rob plops on to the bench he realizes and lets out a nervous laugh, the adrenaline of being caught slowly wearing off. "What the actual fuck Aileen. What even happened just now?"

Aileen puts a finger on his lips. "Shh. It's time for me to return the favour from this morning. We'll talk after. Just you and me, remember?" Aileen pulls down his pants again and fishes out his quickly softening dick. It's still glistening wet.
"It's clearly not just you and me -- whoah.." Rob wants to protest, but is quickly persuaded to drop it as Aileen takes him into her eager mouth.

Aileen tastes a remnance of herself on him as she explores his cock with her tongue. It feels a lot different now than last time when it was fully hard. She has to smile as she feels his cock harden and expand in her mouth. A feeling that fills her with unexpected pride and arousal.
She focuses on his grunts and moans to guide herself. At first he seems to be less enthusiastic than last time she had him in her mouth.
It doesn't take all too long before she feels him relax and give into his pleasure again though. Soon she feels his hand on the back of her head. It's a small gesture, especially considering where they are and how this situation came to be, but it lights a familiar spark within her. She felt that same spark when he'd aggressively ripped down her pants the night before. It reminds her of the way his hands pushed aside her own to give him access to her pussy this morning.
She presses her face forward, trying to take him deeper, letting his hand be a weight on her head.
She has to pull back to not start coughing, but Rob's moans tell her that he's close. He liked what she just did.

Aileen pauses, keeping only the head of his dick in her mouth.
For the first time since she went on her knees in front of him, probably because of her own nervousness and adrenaline, she opens her eyes.
She looks up at Rob and sees him leaning back, with one arm over his face to drown out his surroundings.
Aileen flicks the underside of his dick a few times with her tongue, but otherwise remains still.
Finally, Rob seems to catch on and puts pressure on the back of her head. He wants more. He demands that she dives down again.
A moan escapes Aileen as she complies.
Doubling her efforts, she bobs up and down, letting his hand lead the rythm.

With his hesitance now gone, his orgasm comes quickly.
Aileen feels him twitch and contract before she feels his cum hit the back of her mouth. A moan escapes her once again as she looks up to see his body being overcome by pleasure.
It all happens quickly in the moment and she ends up swallowing a bit of his cum. She decides that the taste isn't as bad if she ignored the texture, so she swallows again after plopping him out of her mouth.

Only when she goes to stand up does she notice that her own hand had found it's way between her legs at some point.
She looks up at him, pushing down the insecurity about her inexperience and gives him her best proud, sultry smile.

Rob's face is flushed red and he seems to feel similarily nervous as he returns to earth from his orgasm. He does give her a smile as they lock eyes. A smile showing a mix between awkwardness and that dominant, content smile men sometimes seem to get after cumming.
However, his smile goes away as he pulls up his pants. It is replaced by an honest and more serious face. She grabs her own clothes and sits down next to him.
She's about to make a witty remark to break the silence and disperce the insecurity she feels welling up in herself when she looks at that expression, but Rob gently puts a finger on her lips.

He kisses her, fleetingly. When they separate again, he seems to search for words.
"Listen Aileen, that was incredible, it really was, but I think we should talk about what just happened. All of it."