Hot Summer Job/Leave it there for now, you don't want to push your luck
Best to leave it there. You've pushed Larissa enough as it is. You've essentially just met her despite her playing with Bree every now and then. It's at least the only time you've ever had a meaningful conversation with her. So you move on to other topics ranging from home schooling to Pokemon.
After lunch (sans Kylie) and some cartoons, Larissa convinces you to play some Pokemon. It at least wastes some time to make the day go by faster and is admittedly a little fun, but Larissa doesn't even seem to be that into it. If anything you could swear she was flirting with you. It's probably in your imagination, odd thoughts about your sister from this morning being projected onto her doppleganger. Besides, isn't Larissa even younger than Bree? Still, she's saying a lot of random crap to you, doing a lot of giggling, adjusting the flimsy straps of her dress, and even playing with her hair. Most damning, she hardly even cares about winning. You beat her in the arena several times over before her mom steps back through the door and exchanges some pleasantries.
"Thank you so much for this Riley! You don't know how helpful it was for you to stop by today."
"Mom! No!" Larissa cries, sensing your departure. "We have to play another game!"
"I don't think Riley wants to be put through more of your Pokemon sweetie."
Larissa is instantly offended. You shrug. It's not like you have somewhere to be. "It's okay. I don't mind. Besides, I've got a streak going."
You finish up your current game then reshuffle for another go. Larissa substitutes a bunch of cards, her focus on beating you now unbreakable, trying to ensure she has the upper hand. It works because she stomps you into the ground with her revenge match.
You hang out for a little while longer, chatting with Carrie (as she prefers to be called) with Larissa at least hanging off your words if not your body. Carrie offers to let you stay for dinner, but you politely decline, partly worried or guilty about already seeing too much of Kylie to stick around any later and have that topic come up. Carrie pays you a little extra for staying late and makes another offer.
"Are you free again tomorrow? I could really use you, but first thing in the morning. Come by as early as you like."
"Sure! Can do! I'll see you then. Both of you!," you add, poking Larissa in the stomach and making her smile.
You think about how great of a gig this is on your walk home. A wannabe nudist teenage girl with her flirty younger sister and their super inviting mom? Maybe you can convince Carrie to adopt you!
Just before you step into the shower at home to help rinse off the sheen of sweat accumulated from the Callahan's non air conditioned home, you hear the front door close with a heavy thud. No doubt mom and Bree are here. You spend a long time to yourself in the shower seeking some solitude, and some more time alone in your room, then eventually get yourself dressed and head downstairs. Bree is sitting on the couch in shorts and a t-shirt, scribbling into a duotang.
"Did you mess up my room?" she asks, barely glancing up from her work.
"I think you did that. I just tried to clean it. Someone has to sort out that pigsty."
Bree grumbles a bit but keeps her focus on her work. Seems mom isn't home, having just dropped Bree off. You grab a quick snack and fart around for a while until mom and dad eventually make their way home. You brag at dinner about your new job but your parent's are barely impressed. Your dad was probably hoping you'd get some more useful work experience.
You notice Bree is being weirdly quiet, but nothing too concerning. It's not until the next morning at breakfast that you notice she's a bit fidgety on top of quiet. She's wearing her skort today, the only one she owns, which happens to be quite short and really shows off her legs, not that you've ever checked out her legs. But it's a pair of legs that she's keeping very tightly closed this morning, even when standing. And then you start to wonder when she crouches down awkwardly for her bag... are there shorts under that skirt or not?
Bree and mom leave rather promptly but you take your time getting ready. Carrie is so chill, she said you could come over as early as you want, but you don't want to spend all day there and don't want to seem overeager either. Instead you stroll over a little after 9 AM after some quick rounds of video games to tide you over for the day. It seems that wasn't what Carrie was expecting however.
"I was hoping you'd join us for breakfast," Carrie explains with a bit of a huff after letting you in, irritation in her voice.
"I, uh... just didn't want to impose." You were really just being lazy, but it's hard to come up with a better excuse with Carrie darting around in nothing but jean shorts and a tube top. She's got an amazing body, one that's especially impressive for a mother of two. You can see where Kylie gets it from. And now you're kicking yourself for not rushing over here.
"Believe me, if I think you're imposing I'll tell you," announces Carrie, slinking past you with bedroom eyes. "But right now I have to go," she adds, before darting for the door. "Kylie didn't come down for breakfast. I sent Larissa to get dressed. I'll be out longer than yesterday. I hope that's okay."
"Huh? Yeah! Of course. Take your time even!" you reply, trying to be accommodating.
"Thanks Riley. Again, I am grateful for this, really. See you!" she waves, closing the door behind her.
You haven't done a lot of babysitting before, so you're hardly sure what to even do when you're left standing here by yourself. Wandering through the main floor you doing some light snooping. Carrie has a collection of alcohol that puts your parents' to shame. You don't see any pictures of a former dad or potential boyfriend anywhere, just a few framed shots of the girls when they were younger. After a few minutes you contemplate wandering upstairs but it feels safer to stay down here for now. You put your feet up on the couch and turn on their TV. It isn't long after that Larissa makes her debut. You sit up when you spot her on the stairs.
"Hey," you start, obvious confusion in your voice the moment you notice her. "You... looking for a shirt?"
Larissa looks giddy as she hops off the bottom step. "Nope!"
The cheerful grade schooler just sauntered downstairs wearing form fitting leggings and not much else. No socks, no shirt, just skin tight pants and a smile.
You look her up and down, simultaneously knowing that this shouldn't be a big deal and yet getting weirdly turned on. Is it just because she's a girl? Is it because she looks so much like your sister? Or maybe it's that knowing naughty smile on her face that's giving your dick permission to twitch.
"So... you're just hot then?"
Larissa shrugs. "I dunno. I don't have to wear a shirt if I don't want to!"
"Did your mom say that?" you ask, still wary.
"No, you said that!" she explains, beaming.
So this is from your conversation yesterday. You were just messing with her, but you clearly have a lot of influence already. Larissa probably doesn't get a lot of interaction with others and seems to have become quite taken with you without much effort.
"I can do a headstand. Wanna see?"
Larissa presents herself to you with a bunch of amateur gymnastics moves, aiming to impress. You try to fight down the chub in your pants, but this cute little girl knows what she's doing. She's prancing around her living room topless in front of a boy and blushing with embarrassment. She's probably been thinking about doing this since yesterday.
She pulls you up off the couch to help her with a jumping somersault. That turns into some playful wrestling and tickling and soon you're flipping her upside down, tossing her over your shoulder, and twirling her about. You quickly regret putting on jeans again today as soon as you start exerting yourself. You'd think you would've learned your lesson from yesterday, you're just so used to throwing on jeans.
"Hold up, I'm getting hot too." You peel off your shirt and toss it beside the couch. Rissa giggles a little then throws herself at you again, the physicality and increased skin-on-skin contact frustratingly getting you even hornier.
The two of you easily kill an hour with all this horsing around. She makes up a weird game like Simon says but where she has to evade you the whole time. You don't mind chasing after her, but as the day gets hotter it starts to take its toll. You and Larissa are both getting hot and sweaty.