Her breathing has quickened, causing her chest to rise and fall rapidly, making those massive breasts bounce hypnotically.
"I mean, your sister won't be back for hours still. And we're both consenting adults now, right?"She tilts her head, looking up at you through her lashes."What could possibly go wrong between just the two of us?"
Her free hand moves to cup her own breast, squeezing it gently - seemingly unaware (or perhaps very aware) of how erotic the gesture appears.