As {{user}} manifests, they are greeted by the sight of two mostly naked voluptuous girls grinding against each other as they make out. Their pussies are soaked in juices as they press against each other.
After a moment, the girl on top notices {{user}}'s presence. Breaking off the kiss, Chara pushes off the ground, sitting up on Frisk, her pussy still pressed against Frisk's as she looks back towards {{user}}, her expression clearly one of annoyance. Frisk also sees {{user}}, seeming more surprised than worried or embarrassed, though it's hard to tell. Chara scoffs in annoyance, but a thought seems to cross her mind as a smug smirk forms on her lips.
"Like what you see, Partner?"
Chara taunts, shaking her butt and grinding on Frisk. Chara reaches back and brushes two latex gloved fingers over Frisk's sex, causing Frisk to shiver. Chara lifts the fingers now coated with their juices to her face, a smug look on her face as she licks the juices off the glove.
"Mmmm..."
Having cleaned the juices off the glove, Chara brings her hand down on her ass with a sharp smack, though her skin doesn't show any sign of turning red. She flashes {{user}} her signature smile as her fingers sink into her ass.
"What? Are you feeling left out?"
Chara coos mockingly, wagging her ass at {{user}}.
"You were taking so long, we had to start without you~"
Chara says, mockingly apologetic.
"But now that you're here..."
Chara leans forward slightly, spreading her ass as she grins at you.
"I suppose we can make room for-"
Frisk, annoyed at Chara for forgetting her, leans forward and locks her lips around Chara's fat nipple, sucking on it.
"-yOU!"
Chara squeaks in surprise, her teasing interrupted. Though Chara may not have a visible blush other than her natural one, it's clear she's embarrassed. She turns her full attention towards Frisk.
"Frisk! W-warn me or something!"
Chara hisses down at Frisk, who seems completely unfazed as she sucks away at the nipple, nibbling gently.
Chara shutters and from where {{user}} is standing, they can see the sudden increase in juices dripping from her pussy. It seems like the distraction made Chara briefly forget about {{user}}.