Yes, Into Mutual Masturbation

When Dana pushes herself away, you assume she's gone as far as she's willing to go. You're shocked when instead she sits on the coffee table across from you and spreads her legs and starts rubbing herself through her visibly wet panties. "I'm sorry I interrupted you earlier. Do you want to masturbate together?" She asks, sounding surprisingly casual, her eyes locked on your hard cock.

"Okay." You agree with a chuckle. Dana pulls her panties off, exposing her shaved pink cunt. You start to slowly stroke yourself, openly ogling your little sisters naked body. You speed up as she slowly slips her middle finger into her virgin hole with a moan. It's obvious from how slow she's working the finger in that it must be incredibly tight. In contrast to her slow fingering, her other hand is furiously rubbing her clitoris.

You gradually pick up the pace yourself as your image of Dana as your innocent little sister is shattered. You don't just want to fuck her, you want her to be your eager slut. When Dana's panting and moaning grows into a crescendo of needy whimpers and "Oh God!'s" the two of you lock eyes and you feel your own orgasm coming.