#dentoscest

"so," trinity says pointedly as she grinds down again. "just touch my fucking tits already before i change my mind."

"right. yeah." dennis nods, quickly looking away from his sister's face and down to her chest. "okay, uh..."

he tentatively moves his hands, peeking up at his sister for feedback. when she shoots him an unimpressed look, he refocuses on her chest and tries again.

"oh for the love of–" trinity grabs over his hands, guiding her brother's fingers over her soft, still pool-glistening skin.

dennis's breath hitches when she guides his thumbs over her nipples, then squeezes them between his thumb and forefinger. when his sister moans softly and starts to move in his lap again, dennis looks up at her with wide, hopeful eyes.

"eyes on your work, dummy," she snaps without looking at him.

dennis obediently drops his gaze back to his sister's nipples, but his mouth begins to water as he watches them darken and stiffen at his touch. he's so caught up with considering whether or not trinity would let him kiss them that he doesn't even notice when his sister unties her bikini bottoms and tugs down the front of his swim trunks to–

"ngh-!" dennis chokes as his sister's soft, wet cunt grinds across his cock.

trinity smirks, then does it again.

"f–! ohmygod." dennis's hands fly to his sister's hips. "okay. uh." he chuckles awkwardly through gritted teeth, then glances nervously at the patio door. "you– you can't just–"

At first, Trinity mostly stays in her room.

When she does come downstairs to eat dinner with them, she's always surprised at how happy they all are and how well they all seem to get along. She mostly rebuffs their attempts to include her but, even if she doesn't know how to show it, she does appreciate their efforts.

Still, as she watches them, she's a little wary of how affectionate her foster dads and brother are. Dennis is always kissing them on the cheek or snuggling with them on the couch for movies and his dads are always touching Dennis's shoulders and arms and pressing kisses to his hair.

At first her stomach churns with disgust. The memories of her piece of shit sperm donor are still fresh in her head and she can't fathom why any dad or son would want to touch each other like that.

But eventually, as she watches Dennis kiss his dads' cheeks goodnight for the hundreth time, her stomach begins to ache with something else.

Something like... longing.

So when Trinity suddenly thanks Robby for breakfast with a quick peck on the cheek one morning, Robby nearly drops the plate he's setting down in front of her. Jack and Dennis pause and look at each other, but immediately resume eating when Trinity glances around awkwardly.

The cheek kisses keep coming though and soon enough she's piling on the couch with them for movie nights, her feet and legs tangling up with her foster brother's under the blankets as Dennis rests his head on one of his dads' chests.

Some nights, she even sneaks into Dennis's room after their dads go to bed to whisper and giggle with him until they fall asleep. Or sometimes, when the memories are just too much, she simply crawls into his bed and curls herself around his back with out a word. Most of the time Dennis barely even wakes up, just gently squeezes the arms wrapped around his waist before he drifts back off to sleep.

When Trinity gets a crush on a girl at school, her dads lightly pester her for details over dinner, but a potent glare from her quickly shuts them up. She doesn't even tell Dennis about her either, which doesn't really surprise him, though he does wish he at least knew who it was so he doesn't accidentally make things awkward at school.

But one night, during one of their now nightly sibling snuggles, Trinity finally admits her secret to the back of Dennis's neck. The girl herself isn't really the issue, it turns out; Trinity's mostly just nervous because she's never kissed anyone before and she doesn't want to mess it up.

As her brother twists around in her arms to look at her, their knees slot between each other and one of his arms slides loosely around her waist. They rarely snuggle facing each other, but their bodies are so accustomed to each other's now that their limbs slide and slot into familiar joins without much effort at all.

In the dim moonlight, her brother's round eyes hold steadily against hers. He doesn't move or speak, just rests comfortably in her arms, but she can see the gentle offering in his eyes.

When Trinity leans in and presses their lips together, Dennis lets her take the lead — only opening his mouth when her lips part against his, and only sweeping his tongue across hers when she surges up against him. It's slow and exploratory and uncertain and the minutes that tick by seem to last for hours.

When Trinity finally pulls away, her eyes cast down to where their bodies are still tangled up in each other and she flushes. She doesn't feel any sign of her brother's arousal, though, and she's not sure if that's comforting or not.

She bites her lip, and Dennis ducks his chin until she meets his eyes.

"Hey. That was perfect, Trin." He smiles softly and nudges her nose with his, then nuzzles down her cheek. "She's gonna love you." Then her brother adds, with a teasing squeeze of her waist, "Whoever she is."

Trinity rolls her eyes and elbows her brother's side, but returns his smile as he turns in her arms again and settles back against her.

As she wraps herself around him, she's surprised that it doesn't feel any different to hold him like this now. She expected it to, had been preparing for it. But their kiss seems to have been just a brief sidestep on their way to sleep. Not something to ignore and forget, but not a life-altering event either.

If anything, she feels a bit closer to him now.

She snuggles up against Dennis's back and presses a kiss to the back of his neck. Her brother hums and reaches down to squeeze her calf where it's hitched around his hip.

As they both drift off to sleep, Trinity's nose nestles into Dennis's curls.

"Love you."

A squeeze.

"Love you too, Trin."