You Invite Her

"Want a closer look?" You ask Lily.

Lily seems startled by your question but she keeps staring anyway. She slowly nodded her head yes, and she slowly got on her knees in front of your twitching dick. You then continue to stroke yourself in front of Lily as all she does is stare in awe of your pulsing member.

"Hey you mind helping me out?" You ask her.

"What do you mean?" She asked back.

"I mean can you jack me off or give me a habdjob or something to help me finish faster?"

Lily blushes but doesn't objects. She slowly raises her hands to cup your balls in one while your shaft in the other and began to fondle both. You start to moan as the sensation of your sister' soft hands running along your body gets you harder. Lily continues this service while you get closer on edge.

That was until you said, "Lily I'm about to cum".