Sexy Fun Times/Laid/Park/Frame

You walk over and sit next to the young woman with the kids; she briefly looks up from her phone and then goes back to whatever game it is she's playing. You pull your own phone out and make out you are checking emails, while you are really watching the kids. A boy and a girl, both with bleached blond hair and, judging by the way they are using the equipment, pretty fit. The boy is wearing shorts and a T-shirt and the girl one of those little strappy dresses that look so cute and shows off her panties whenever it rides up. The baby in the stroller is sitting up, sucking contentedly on a dummy and looks curiously at you. When you poke your tongue out, it copies you.

After a few minutes, there's a loud yell, and when you look up you see that one of the children has fallen out of the climbing frame. The woman sighs, puts her phone away, goes over to the little girl who is sitting on the ground bawling and picks her up. "Where does it hurt," she asks as she sits back down and wipes the snot and tears off the child's face.

The girl points at her tummy and the woman stands her up and lifts her skirt up to have a look. She's got her back to you you can't help thinking what a cute little butt she has, barely covered by skimpy pair of panties. It seems that the girl meant a bit lower down than her tummy, so, ignoring you, the woman pulls her panties down to check between her legs. The girl promptly stops crying and starts giggling, and the boy comes over to see what's happening.

When the woman puts the girl back on the ground and pulls her panties up, the boy gives his sister a sympathetic hug. "Cute aren't they," the woman says, looking across at you and then down the bulge in your pants.

You shrug. "Very. Are they yours?"

She laughs. "Nah! I just look after them during the day."

Over the next few minutes, you discover that her name is Susan, she's nineteen and a part-time student. She is a kind of live-in nanny for six-year-old George five-year-old Alice, and the new baby, Sophie. Their parents are wealthy and they all live in a big house overlooking the park. "They're good kids," Alice says, "But it gets pretty boring with just them for company. It's nice to talk to a grown-up for a change."

"I need a wee," George says.

"Me too," says Alice.

Susan looks over at the public toilets. "How about we go home and get something to eat." She loads their stuff into the stroller with the baby who promptly starts crying. Ignoring the protests the two older children hold hands and set off as a group.

• She invites you to come with them
• She sticks her hand out; "Nice Meeting you," she says